Well I'm loving mine, I've had it fitted now including there sports cat for just over a month.
It's developed a nice deep tone, whilst remaining not too loud and does not suffer from any cabin drone / booming!
Weighs some 8kgs lighter than original exhaust and uses a single design rear box (can not been seen from behind) with 90mm rolled in slashed cut pipes. Bore size is 2.25".
Also comes with a lifetime guarantee. Combined with there sports cat it is allegegly good for 6hp.