Small, light weight, easy to program. Does all it says with above limitations.

Documentation is terribly written, by Japanese interpreter.

Decent unit. Very nice display. Easy install, depending upon the vehicles harness. If you do not have a chassis dyno or at least a logging O2 data collection device (Novation etc.) you will NOT be able to set up properly. Do not kid yourself.

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Haltech, Holley 950, Tec-3

-Price when compared to stand alone units -Vtec switch over points can be adjusted easily -Looks nice when installed on steering wheel colomn or in dash -Easy to read at night or during day -Easy to adjust air/fuel ratio (recommend using a good stoichiometry quage). -Good power increase for price

-Only a piggy back to stock ECU, so you are limited in adjustments -You really need more equipment or a proffesional tunner to tune it properly -Kinda tricky install (you are splicing into the ECU) unless you use a wireing harness which costs an extra $150

Very nice product (as expected with Apexi name). I suggest using an air/fuel ratio guage and a gtech pro to get the best results-or take it to a qualified shop with a dyno. Installation is not for the beginers! It took me approx. 4 hours to install while being very, very careful. Without saying what the others didn't-my gas mileage has gone from 31 to about 36 miles per gallon (on average). This thing has already paid for itself.

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none

Ability to move VTEC points and tune A/F when doing so. Good for making your engine if you have mods such as a high lobe or aggressive cam(s) Graphic displays are pleasant to look at and are clear in any type of light environments. Helpful doing "rough" tuning at the track, quick and easy.

You install it wrong and your ECU will not forgive you.(Not recommended for average beginner.) Does not have a reading for A/F itself, although allows you to manipulate A/F Altering VTEC might throw a 22 code if you hover around the switchover point for a period of time.(found that out in sweepers at the track) VTEC is utterly useless below 4500 RPM.

The V-AFC is a nice product. The options that you can manipulate is quite convienent and it is pretty user friendly.(That's if you know how to use buttons.) Pretty simple design that allows you to correct some of your woes if you have a modified un-tuned motor. Not too shabby for a "poor man's stand alone." I am definately pleased with it and would recommend it to others.

Easy install, looks great, does what its supposed to do.

Piggypack, not as good as standalone but works good as long as its installed right and tuned good.

I love this product. Helped with tunig my Turbocharged Accord. Combined with MSD BTM and an additional injector controller it has made for very nice precise tuning. Installation is simple if you have the ECU pinout diagram. I installed in less than an hour and have never had any problems! Don't expect hugh gains on a stock engine, the more upgrades you have the more you'll need a the tuning done using this.

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HKS AFR, Field SFC.

Looks, adjustable visual settings, compact, easy to program.

Can have a memory to store different fuel maps. I would like a minimum of three. (It can only hold one at a time) Installation... I did it myself with no problems. If you are mechanically challenged, don't even attempt it as you can really screw your engine up! The installation manual is not that clear.

A must if you have a Vtec engine and want to gain HP. The display at night is great with it's deep blue color. As the previous posts state, it can display a number of vital readings from your engine. 2 analog displays are available or up to 4 digital displays. There are other choices, like Hondata, but you might have a limit on how much you want to spend for your car too. Apexi is a good choice. To get the maximum out of this product, you need to have the car dynoed at a good shop that knows how to tune V-afc's. You can lower the Vtec setting just about anywhere, but you will probably find the best setting between 4400 and 5200 rpms.

Tunability.

I would like to see an A/F gauge built in.

So far, so good. The wiring diagram is kinda tricky b/c they don't give you an orientation of what view your are in. The diagram is as-if the plugs are still connected to the ECU. I installed it myself, but would recommend amatuers go to a shop. Once set up, you can use an A/F gauge to set it up, but a dyno will be the only way you'll see good gains.

displays well, much better than field

hard to install, took a professional honda speciast an hour and he screwed up 1 wire, that is misshown in the manual, get the NEWEST MANUAL! !!
VTM wire is it, the blue one

Displays well, u can set ur vtec at 3000 in /out
impressive gains once vtec is lowered
decrease gas mileage as vtec uses a lot of fuel
if u have lots of mods, u can change the air/fuel ratio
u need a another gauge to see the air/fuel ratio tho.

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stock, wtf, my car vtec at 5600 and red line at 6350

Set VTEC to kick in at any RPM and manage your fuel and air mixture....Kicks ass at the street races and 1/4 track....13.96 w/ street tires

Can mess up your ECU if installed incorrectly

I LOVE IT.....KICKS ASS ON TRACK AND STREETS AND IS WORTH THA MONEY

Looks cool!improves a little performence..

Doesn't gain much hp..
Although it can kick vtec eaier, doesn't make much difference...

The display is awesome! can display intake pressure, throttle position, engine RPM, air correction rate, ECU VTEC solenoid output, and V-AFC VTEC solenoid output.
Do not let unexperienced people to install it and setup.. I strongly recommend people go to A'pexi distributor, because they know what the best setting is for your car.

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HKS..GREDDY FUEL SYSTEM