yup used it quite a bit. been bodybuilding for over 11 years. currently sit at just over 127kg so i;m not a small guy.
problems i found with it are its simply not designed for any real lasting effect. brill for the gym and to hit the clubs a few hours after but the facy is it doesnt really do anything else.
if you want a good delivery system that will shuttle nutrients into your muscles then get a good creatine that has some dextrose or something with a high GI to make sure you get the necessary insulin spike so you can get those carbs and protein into your muscles after training. you'll notice that a pump will stay much like these pumping supplements mainly due to the higher glycogen uptake and its got more of a benefit due to the release of the most important anabolic hormone of all, Insulin!
depends which way you want to go, but if you're happy going further down the line you can look into stuff like igf and hgh. you'll get some good fat burning with the hgh and some decent health benefits provided you use it right.
igf, while stronger is not so good for fat burning. but you do get to a state of hyperplasia (cell split and replication in a real real basic term) which you wont get anywhere else, provided you can mechaniclly overload your muscles enough.
and no, injections wont turn you orange.