Hey there jdazzr, nice of you to ask. The short answer is a big yes! It's the best thing you can do for better acceleration in all gears, especially the higher ones 4-6 where I find myself leaving it in 5th a lot and there is MUCH improved accel. I only guessing it feels like a 636 where you can pull a higher gear as the torque in all gears is much improved.
If i were you I wouldn't hesitate to do it, I'm glad i did, but I would never consider more than -1 front as the revs in each gear are a bit higher but not a concern, even on the highway. More than -1 front in my opinion is not good, but each to their own.
If you look at
Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator you will see that -1 front will have you speedo reading about 6.7% higher than what it is now. So, what i did was to GPS my real speed as accurately as possible and after much testing with that, MY bike was a confirmed 7.5% over (stock gearing) plus the 6.7% with a 15T front. Then I bought the SpeedoDRD calibrator from the USA shipped to Brazil and if you check on their website you can work out the calibration percentage. Basically i needed to input a 12.8% negative to the device which is very easy to do and now I'm spot on with the radar readings.
I don't know why different bikes have different speedo errors but they just do, maybe in the US they are different as I've read that many ZX6Rs there are over by 10% stock, so you must check that out. When I was doing 100 actual, the display flicked either 107-108, but it's definitely 7.5% on mine.
I don't think it's necessary to buy the speedhealer which is more expensive and apparantly not very waterproof like the SpeedoDRD.
I kept the same chain and rear sprocket as all is good in my opinion, unless you are close to changing everything anyway, you may decide just to change the sprocket only, keep in cheap and simple. I got Kawasaki to do it for me and change my rear tyre at the same time. They did it real quick and didn't charge a lot for doing it. I would bother trying to do it yourself unless you have the tools. The other option would be to go up to a 45T rear sprocket and still keep your original chain, BUT my rear still looks like new and my front was all hooked looking, so it may better just to go with the front as it wears quicker, plus you wheelbase will be slightly longer, instead of shorter, and save money.
One more thing, if you go -1 front, you will get a possibly unbeatable combination in terms of overall chain and sprocket wear characteristics as compared to stock or +2 in the rear. Another good reason.
I say just do it and you'll be pleasantly surprised, good luck.:smile2: