I've used it a couple times, in fact I still have some in my cabinet as we speak. Hard to say what I think of it really. I didn't feel like I gained a lot of strength on it, maybe a couple extra reps here and there but nothing super spectacular. Gained some size, and felt like I kept it after I came off but can't say how much was muscle really. I got up to 230, which is my biggest ever, and definitely looked and felt massive (I'm 6 foot). I was doing 531 at the time if that gives you an idea of training/workload.
The main drawback for me was the back pumps. I've never dealt with that with anything else, and these were to the point of questioning if I strained something. At first they only came on when I was squatting or deadlifting, but eventually they started popping up during what should have been non-lower back work, like rows. And standing up. I never understood the term crippling back pumps until I used tbol. Taurine helped at first, but after a while it barely touched the pumps. Can't say I was 'bloated', but I definitely was not cut up - but I was not dieting, I was eating for size so that would be the main factor IMO.
Having said all that, I've mainly used it alone. I have used it in conjunction with MHN, which I really don't recommend. Only issue was some lumps (yes, that's lumps as in plural) around my right nipple which went away after discontinuing use. Again, didn't feel like I got anything out of it so I don't recommend it based on that. The lumps showed up at a high dosing level (I believe I was slightly above what is recommended), and felt like my lymph nodes were swollen on that side from the pattern of distribution. Aside from that, I've not used tbol with anything else, which may be part of the issue. The prevailing wisdom being that oral-only is pointless, you might see better results if you use it with test or something. I may try it again in the future, since I already have some. I'm currently on the cruise portion of a blast and cruise, so I may throw it in when I blast again.