I ran a Jardine 2-1 for quite a while. I had no isues with it at all except I wasn't a huge fan of the way it looked. The welds and rivets all held strong through many miles. The sound was pretty impressive, in my opinion. As far as HP gains, I installed a PCIII at the same time I installed the system, so I definitely experienced an HP gain, albiet mostly in the top end. Quality and as madbuyer said, readily available replacement parts. I say go for it if you like them.
05 GSX-R 1000