I had one and sold it on after a long while, I had it running with a de-cat and was only impressed with the sound really? Chucked it in for an ITG panel filter and have been satisfied with that especially in the hot weather. I ran a 15.047 iirc with the maxogen & de-cat at santa pod in the heat. The car must be properly re-mapped as I had my car rr'd and had a dip on both power and torque curves near 6k I think?...
If you have the cash, they are the best money can buy, but it is a lot of money. I don't know what mods you already have, but if you are pushing the 200bhp barrier then you must have spent a fair whack on your car already, so there is probably no reason to skimp on an IK. If you can pick one up 2nd hand, then deffo go for it....
They are well made, a bit of a bugger to fit, but look better than the other kits imo. I would however be interested to see one of these kits line up with the above reccomendation of a phase 1 airbox with an itg filter & a decent coldairfeed.