I own the following...
EBS BassIQ
Maxon AF-9
Robotalk (not the newer bass version)
Maestro Filter/Sample & Hold (same as Robotalk)
Boss SYB-3
Akai Deep Impact
Lovetone Meatball
DOD FX25B
Studio Electronics ModMax Envelope Phaser
Electro Harmonix Bass Micro-Synth
Electro Harmonix PolyPhase
...and, they are all totally cool in their own right.
But, the one I choose to gig with is the EBS BassIQ, with the internal trimmer set 100% wet. It's simple and easy to dial in the sounds I need, it sounds great... real nice, wet, funky sound, feel, it's small, compact and it's built like a friggin' brick.
Others I'd still like to check out include the Emma Discombob., MXR M-188, and the Korg G5.
~ Charlie