I’m doing an upper/lower style thing right now, but I have dabbled with 3 day full body and even 4 day full body routines in the recent past. The 4 day one ended up beating my elbow joints up after a few months, so I had to drop that, and the upper/lower lends itself best to training 4 days a week. The idea always intrigued me, and as I said I grew tired of being on the verge of injury and immobile for half the week.
I finally took the plunge to try it out after reading Alpha’s training log on here and things like Jamie Lewis’ Chaos and Pain blog.
If time became more of an issue I would have no problem dropping back to my 3 day full-body Waterbury style training, or an alternating A-B type routine laid out similar to this if I wanted a bit more mass focus.