I have both, MX Revolution seems to lag everytime I download something at full speed (I have 20MB cable) on my wireless line - it seems wireless signals interfere with the signal of the MX Rev ( I had 2 MX Revs both with the same issue) but the MX 1000 is perfectly fine.
Shame as the MX Rev is a much sleeker mouse!
Other way around for me, my MX1000 seemed to skip and jump for no reason, my MX Rev has been spot on.