I bought the studio pack, not the uber. I think its great. I don't know if 2.6 has anything to do with it or even if these were created under this new firmware but to me their is a nice fullness in the mids that sounds a little special. It may simply be MW's ears and how he sets up the amp and equipment used/technique.
I like how the tags were well utilized. In addition and possibly related to a previous post, I found that my strat shined on the profiles that were tagged as being created using single coils. By no means does it mean my strat didn't sound good on the rest but just something that I noticed. I only had time to go through it quickly. There are some very crisp cleans that are well EQ'd (Deluxe, Twins and several others) and also some nice low gain profiles sprinkled in. There was one that was low gain using some Kirk Hammett signature amp that was great.
Definitely a recommended pack.