I have the original. A great piece of kit. Very respected.
Yes, a mainstay in recording studios all over the planet. Lots of bassists have them in their kit as well.
The reason I didn't want the original and now have a real version 2 on the way is the new features. They really upped the game. First, they added a Midrange knob, that alone is huge.
Then, they added 2 switches. One switches the bass tone control center from 80hz down to 40hz, excellent if you play 5 or 6 string bass and need to fatten up the low string.
The other switch let's you choose a mid frequency - either 500hz or 1000hz. That's very useful as well, especially in the context of all of the tone controls offering plus or minus 12db.
If they'd never added those improvements I probably would be happy with one of the other Tech 21 SansAmp bass pedals but since they did I might as well get the one I really want.
Or I will just keep wanting it!