Totally depends on age. If you ever plan on having kids you shouldn't, plus being on for a really long time (say since 25-26) then you're putting yourself at risk for some problems later on that you could have for the remainder of your life. But like Nelson said, if your 45 go right ahead, would probably do more good than harm ha.
It's probably better not to have a crutch like TRT anyways, it's never good to depend on something for a properly functioning body. I've heard some rumors about the gov. trying to pass a law prohibiting prescribing 10ml vials to TRT patients, and forcing you to go to the doc for every injection. If they get the ball rolling on that I have no doubt it'll pass, they'll pass anything that they'll make money on...I don't remember where I read it, or even whether or not it's true, but it's something to think about.