This was my first litre sports bike, I had always ridden 600's before this and was totally stunned by the difference! A tad naive you may think but honestly, if you have only been used to a 600 with the odd shot of a mates 'thou' nothing can prepare you for what this bike will do to you!! I bought it off a friend when it was 7 months old, he got the last Ltd Edition 'stealth Black' model in the country but needed cash and I fell in love at first sight and was only too happy to part with said cash! I removed all decals and got a Yosi tri oval carbon exhaust put on, rather than go the power commander route my local dealer (Saltire Suzuki, Edinburgh) suggested I let them set it up on their 'Yoshi Box'. Sure said I, beats paying £400 for the commander!! The difference with just a little setup is amazing, I thought the bike was a rocket ship before, now it is positively lunar!! So smooth right through the range, added some extra ponies, and mores to the point, saved me £400 into the bargin!! I would suggest changing the end can, loses a good bit of weight, and put a Yoshi on and ask your dealer if they have a Yoshi box, it may not have the massive tuning range of a Power Commander, but be honest, do you REALLY need that amount of tuning to ride this on the road and the odd track day?? I personally don't think so, and if you can get the most out of it on the road, then you are a better man than me! What I have on mine is more than enough to keep grinning from ear to ear. I removed the rear pegs and got a black hanger on, a pair of black rearsets and this machine looks amazing! Still not sold on the dold wheels though, no idea who came up with that plan?!?! It handles like my old ZX6R, has twice the power and triple the fun! If you are thinking of 'stepping up' then I would strongly reccommend this bike! The K4 was an excellent year for it, before they brough out the awkward "ducks arse" rear end, but after they had ironed out the niggles from previous models! I love this bike and wouldn't change it for the world!!!