What happens if you can make a record 2 old E-Guitareros: A funny song (the first) and then only the same stuff that have already played in their youth. Only evenly with 2 guitars. Boring. The whole course on the highest technical level. But if one of them already has drives, you do not need this. OK, I have not had that yet but do not need :)
Had just more, or perhaps rather 'what else else than' expected. For example, Mike Stern I've seen live with other artists and always thought that was great.