i had a livingsocial coupon for 1 month, and sadly, i got sick halfway through the month and didn't really get my $'s worth. BUT, i got a good feel for Bikram.
I like it, but wouldn't do it as a regular practice; primarily because you do the SAME exact routine each time. i get bored. i know, it's supposed to be good for you to do it that way, but my mind wanders.
my recommendations: chug water ALLLL day, and then drink a coconut water 30 min before class. you will barely need to touch your water during class (which is better!). screw the yoga mat, you really just need a large absorbent beach towel (i think they want you to bring the mat, and it makes you look like you know what you're doing, so why not.). sit closer to the windows - it's cooler on that side of the room! wear pants/leggings - otherwise you will not be able to grab your legs well during the "windmover" pose.
don't feel intimidated if this is your first yoga class or first Bikram class - the teachers are all pretty cool and helpful, and NO ONE cares about anyone else when it is blistering hot in there and you are sweating like a leaky faucet. trust me. it's important to be able to see yourself, so I recommend going to less crowded classes. the 6pm class is the craziest!!!
i like that they have showers in the locker room, annnnd shampoo/conditioner/body wash/face wash/dryers for you to use. so nice!
if it wasn't so pricey, i would probably try to go 1-2xs a week, just for the fun sweat factor.