I've looked into quite a few collaboration options, but always found them unwieldy. This looks promising. I wonder, though, whether distance messes thing up. If his work is with someone else in the same geographical vicinity, then maybe it has a better chance of success than, for example, trying to do a session in LA from the UK. And of course, I assume he's not on AT&T DSL
Also the users would need to understand the implications of remote sessions, which from what I understand, makes it easy for hackers to find back doors. But, it's something I'd like to try out with someone...at $3.99 to use it for a week, it's a no-brainer. And if you do this kind of thing a lot, $99.99 a year would be a bargain.
Wish I'd know about this a few months ago, when Brian Hardgroove and I were collaborating on remixing that Chuck D track...it would have been a perfect test. Guess we'll have to come up with a new project as an excuse.