EOS 7D - really disappointment 4 me

Hi Folks,

I have it @home. I have to say, I am really disappointed. I've bought it regarding superb AF and ISO performance. My experience after playing wit it?

1) Slower (really!!!) AF than my old 40D in low light conditions. In certain conditions (during playing with both cameras) 40D has 100% AF successfulness. 7D have had 2 missed tries (AF was running and nothing... only running up and down)

2) Strange artifacts in higher ISO shooting (something like gallery filters of PSCS).

I"ve shooted into jpeg, with 50mm f1,4.

Any other experiences?
Mat