I am not an owner, but have worked on a fair few TTS rockets and also other bikes with the same brand supercharger( M109 , Vee Rod ). If it is worth any thing, my take on the Rocket kit is this. If one irons the bugs out of the system the bike will run well with the kit. If you wish to make it into a REAL supercharged bike, JUST fitting cam timings to suit forced induction will add at least 50hp to the engine,with NO OTHER engine mods. Any exhaust which fits and flows will work pretty much. Personally I would not have one because it is as ugly as a hatfull of arseholes hanging off the side, but some people love the look of it. Mechanically it works well, although I have never once with any of the kits (so far) of any model been able to stop the belts slipping. This probably does not matter as there is only a very select few who will actually hold it wide open for long enough to experience this problem. Riding the bikes , the thing feels great, particularly with cam timing done. If you have a stock engine and want MORE low down torque (under 3000) you will be dissapointed as there is no boost much until 2850rpm or there abouts. I have , on occasion, had to seek support from Richard at TTS and he has always been receptive to emails etc and helpful. I obviously should not comment on Bob Carpenters gear, but over here in OZ it is way more costly to fit a supercharger kit than to get 240hp from a stock engine. This is partly due to the value (or not) of our Aust $ and partly because the price of the kit is not the only cost of doing the job. One has to fit the kit, buy a fuel pump, at least two drive belts, sundry other bits and bobs, and work on the bike for many days including tuning it. But I have yet to meet some one who wanted to fit a supercharger to save money.
WARP has gone thru this process on his own pretty much, as is well documented here. Some of the things I suggested a long time ago he has taken up, like a boost limiter valve. The R3 kit WILL make 18-19psi of boost at 6900rpm if the belt is not slipping. This is too much if one actually uses the bike for more than a few seconds at those rpm, the pistons will melt. He should be encouraged to put forward his point of view