I boxed for a few years and plan to go back as a heavyweight, it kicks ass. The rush of fighting (or sparring) is unbelievable and addicting, though the minutes leading up to it are unbearable. Someone compared it to 'the green mile', its hard to disagree.
Its not pretty, though. You wont get much recognition, its painful and demanding, and it doesnt bring the aesthetic benefits of bodybuilding. I rarely fought with headgear and then only when forced, I dont advocate headgear, I recommend you research it yourself. I seem to have slightly poorer coordination and memory than before I started with slightly slurred speech, though it could just be all in my head.
Expect broken knuckles and wrists, its part of the game. To this day I cannot do pushups b/c of wrist pains and inflexibility (I could do them before), have 2 dislodged knuckles (Ive lost knuckles for a few days, they magically reappeared), and have a problem with my right thumb that causes me great pain on occasion (like typing, or gripping for an extensive amount of time).
I found that the better a fighter I became, the more humble I was. I was hoping boxing would make me the badass cigar-smoking hero in the movies, but it doesnt work that way.