I only take T, in a gel form. Gel takes longer to act than the injections because it's a lower percent of the hormone but i believe it makes for a more stable hormone level in the long run than injections.
I've been on for 6 months now. I've noticed certain changes but there are some things I still haven't had change. It's all very dependent on the person. Even though my hormone level is pretty stable at 25 (regular for cis-men ranging between 22 and 29) it's still taking awhile for things to change. Wish my voice would drop lol, I can't wait for my voice to get masculine...
Like what Simon said though, trans men tend to fit in quicker but we definitely don't benefit from the same ease of surgery that you ladies get.