I got waylayed, I was interested in the subject SR18 too.
Purely about the sound - how does the 18's compare to the 16? I get the impression they may have caught up with the dmp5 drum modules sounds with the SR18, but I've not heard them. There's not much wrong with the old SR16 sounds, but I always felt cymbals lacked top end "zing" and the drums short of stick attack.
Jim