I'm on U300.  When I saw that MGM and Smithsonian had showed up in the guide yesterday, I called to order the Premium Tier.  After being put on hold a couple of times for a total of about 15 minutes, the sales rep (really nice guy, I might add) said he was unable to enter the order yet, but then offered to keep trying on my behalf over the next few days - nice courtesy.  I told him that if it affected my bill by more than $5 (plus any sales tax) he would need to call me before entering the order and he acknowledged.  Then, out of the blue, he offered me 6 months of U400 for free, ostensibly for calling to order the HD tier and for my trouble.  I'd say that was a nice incentive to try out the new Premier HD Tier.

Woohoo!