(1) I 've used a (guitar) V-AMP with bass and had great results into a Fostex VF160. I don't gig live on bass anymore (not for two decades). It's the least expensive of the POD/GNX/GT/Stomp modeling group and gives you great bang for buck, especially for recording situations.
(2) SysEx stuff (editing, saving, etc.) is done via MIDI.
(3) Using a POD or V-Amp live is probably going to require a MIDI foot controller, especially one with an expression pedal (or two).
(4) There are inexpensive USB MIDI interfaces. I usually use a Midiman Midisport 2x2. Painless. More than I usually need but handy when I need to sync multiple devices or go beyond 16 MIDI channels.
(5) You can go directly to
www.behringer.com and download the manual, software, see th latest V-AMP reincarnations, etc.
(6) I'd say that the primary application for modeling pedals IS recording, as evidenced by the hoops that many users jump through to use them live.
(7) My V-AMP judgements are based on the original version---I have read reviews stating that the V-2 is superior.
Good Luck,
Paj
8^)