Currently at Level 15 and going Commando!! I'm playing this on the PS3. I hope that I can get some storable health packs soon because the few times I've died, they would've been totally avoidable if I'd had a health pack.
I'm really impressed with the upgrades so far. Looking for some Eridium to upgrade my storage and abilities, but its been very scarce so far. Ran into a few Borderlands 1 characters too. A very awesome touch!