I have had some time to spend with my new toy now.
So here are a few words on the subject:
All in all it makes me wonder why I waited so long. This is a game-changer. The overall impact this has on how I do things now is significant.
In terms of gizmoes all strung together and glued/screwed/taped/velcroed to a piece of plexi-glass/wood/padded-custom-case & then running into the amp... I'm done - for quite a while I think. It pretty much has every stomp-pedal that BOSS ever made for bass in there more or less. You can use them in whatever order/combinations you like - and SAVE those combinations. This allows a lot more creativity in a live situation in terms of getting your effects together between/during songs.
It is also Really Easy. That is how it was sold to me & it does not disappoint. Neither do I find it to be as condescending as it might be. The EZ Tone thing for creating a sound borders on that - but how often would anyone use that after getting to know how to use the thing?
In terms of sound processor though -- niice -- I plugged it into my PowerBook via the USB cable & driver software & ran it simply through Garageband as the sound input and output - and plugged my headphones into the GT-10B for the session. WOW. It upgraded the experience tremendously. I even banged out a new song the first night I sat down with it. (Just imagine when I hook it up to some real editing software)
Add that last bit to the ability to back up/restore/mix&match all of the patches that you create via that USB cable to the computer - and now you have a professional situation where you can buy a replacement on the road & get on with the show with very little effort.
And of course - The Sound ... It is really very nice. It is also very easy to be cheezy - particularly with the pitch-shifter - so beware. Hard as is it to imagine - I could see potentially just running through a PA system (with the appropriate monster subwoofers) because you can make the sound exactly what you want.
No they don't come out & say it - but there is clearly modelling of Ampeg, Orange, etc. in there. It makes a difference.