Um - not sure I'm qualified as I've only ever had the one. Nasty little pale blue effort (for a guitar) priced about £40 from the Music Room in Cleckheaton - can't remember the make and I'm at work at present. Fishman do do their own (around £100) but I never had any problems with the guitar version - good strong signal for which I was complimented by several sound engineers at festivals (so it must be OK).

Cheers Sarah