Guys - I got mine the same time Ken did and I have used the heck out of it since! It replaced a Epifani UL502 and I couldn't be happier with it. I don't have experience with the F1 like Ken, so I can comment on the differences in sound.
As stated in this thread, it's loud! it's light and I got the MB carry bag with it. Very convenient, kinda like a mini soft rack, carry in over my shoulder, unzip the front and back, take the cables out of the cable pocket and plug it in. 0 to 60 in less than a minute!
I also have a t.c. RH450 (which is going back) and I used both on a outdoors gig last week with my AE410. The band is too loud and the t.c. really couldn't keep up, had it up to 4 or 5 o'clock, or virtually 100% and it just wasn't cutting it. Swapped out the LMT 800, 11 o'clock, kicked ass! Even though the mute isn't ideal, it was one of my must haves, that's one reason I waited for the PMT 800. The second input and pre - post DI are great features as well. Lastly, on a strictly cosmetic level, it's a hell of a lot less yellow than the LMII!
So, I would encourage anyone to at least get one and try it on the MF / GC 30 day plan. It's hard for me to imagine a better amp for me, at least. With that said, when I send the t.c. back, I think I am going to get a F1 or F500, I need a back up and there is too much good press on TB to ignore this head!