Hmm! Just about to take the plunge and having a read through first. Tried others including Interchange, OS, Zen and leaned toward Cube.
The benefit is an invisible one to removing the copyright and getting the 'extra'support to the customer but the copyright being there is a very visable thing to them too. Well worth having the professional image.
All that was a long winded way of saying agree - the only concern there was with the above post - should the upgrade /charge path be on the cards then will the existing installation be effected or would it be a whole new install with all existing work preserved.
I know a biggy for a small fee

sorry about that.