The 6100 is the 30th anniversary marshall. There are a bunch of different flavors, between the limited edition versions, the black and blue tolexed versions, LM and non-LM mod versions, and 5881 versus EL34 versions.
I had a 6101LE with the LM mod (done later). Mine was the combo, which ran very hot. I really liked the clean channel and Channel 2A and 2B, but didn't really care for Channel 2C or Channel 3 (lead). I also witched the A, B, and C modes were footswitchable.