Well, I downloaded the NXE this morning. Took only about 3 mins. Boots right to the new Avatar setup. Took another 5-10 mins to design my avatar (or you can just select one o the standard ones for 0 setup time).
Here's some points I noticed in my brief use before work...
Very Wii-esque. Nice menu's but slightly confusing at first.
I was looking thru the movies and noticed most of them were rental only (not Netflix...but the regular movie area). The TV shows were still available to 'buy'.
Another 'funny' thing...you can change your Gamercard to reflect the new avatar..for 800 MS points. Wha? Little expensive for something that should be free.
There are several "avatar aware" games in the arcade section. I am not sure but if you already own the previous version it looks like you have to buy it again...not sure.
I bought the "Kelfling" sim game (800 points..or free trial available). Think Guliver's Travels meets Sims. Only got to play for about 20 mins but seems really cool. YMMV.
Overall...I will give it a tentative 7.5 out of 10. I really need to play with it more...but so far, so good.
Jay