While there would be many nice changes (many have already been mentioned)...not having hair growing everywhere on my body would be very nice. I would dress better, not have to worry about covering five o'clock shadow with scrape-on makeup, and have an excuse for wearing nail polish at work.
There are a few not-so-nice things (in addition to standing to pee and playing with my dangly bits)...I would get to work harder for less money, learn to be "catty" toward other females (well, maybe that isn't so bad?), menstruation and cramps is not something I would look forward to, and it would no longer be acceptable to scratch when and where I itch, nor to spit.
Sadly, I think I would still have gender issues and if I got stuck with the same face, I would be a "less than attractive" girl and still not have a date for the Prom.
At least as a male-bodied person, I always have something to play with and never have to worry about getting knocked up by some redneck beer-swilling a-hole (unless I was Brittney Spears).
.....L