I have been doing a modified version of this program for 2 months now and have had very good results. The only variance to the program has been in rotating the Upper Body and Lower Body days instead of doing them back to back.
My rational for that in starting out was mostly due to concerns with the lower body lifts. In the past, I never squatted low enough and wanted to fix that. Also, I had never gone real heavy with deadlifts. So in making those changes I was concerned with doing lower body lifts back to back and recovery.
Like I said, Im happy with the progress Ive made thus far - but should I now switch to doing the back to back days? I'm still a bit skeptical on doing squats and deadlifts on back to back days - but I want to acheive the best gains I can.
Obviously I know what Thibs thinks - but I'd also like to hear from you that have been doing the program.