I used it for a little while the year before last when I had run out of injectable T, and someone had some that they didn't need (as they had switched to injections).
Taking a shot every week or two may be annoying, but personally I found it way more annoying to have to rub gel on myself every day. At least with shots you can just shoot yourself and not think about it for awhile. Also, and this might just be a personal problem, but the high alcohol content in it made my back-acne burn when I put it on.
Some say it is also less effective than injectable T, and I believe it, though I cannot really say since I wasn't on it for long enough nor on a regular enough dosage. Personally, it was not for me, but for those other reasons.