Just updated my 7D to 2.0.3. I just dropped the firmware update on a CF card, popped it into my cam, and updated with the menu. Took about 3 minutes. Works like a charm. I never had a chance to go to 2.0.0, and I must say, the deeper buffer is very nice.
With my Transcend Gold 600x cards, I get a consistent 30 shots (30, then usually +1 extra after a momentary pause if I just hold the shutter button down). I've tested it about 15 times, clearing out my CF card, holding the shutter down in M mode (ISO 1250, 1/1000th, f/8...settings I use fairly often for birds), and it spits out 30 continuous shots every single time. Only bummer is the counter still maxes out at 22.
Canon seems to have used a 4Gb UDMA card (they did not specify what version) in their own testing, and their numbers for continuous buffer depth were 23 (average unspecified CF card) and 25 (4GB UDMA CF card) at ISO 100.