I personally can't recall having heard of anyone, either on this forum, or on the rat.net that have used the 994 kit. Besides the cost, just looking the pic on the BC website, looks like the cylinder wall is getting awfully thin, around the cam chain orifice. Just based on those pics alone, the power might be nice, but I don't think it'll have the reliability of the 904 kits. Mind you, this is all opinion, based on looking at a couple of their posted pictures.