I dunno the speed but it is good.
I'm using ME.
I feel the same with -vip3rleon9-, i am satisfied. It does a great job for its price. Love the camera and the huge screen.
Bad side, hmm... the flash light is not a Xenon light like K800's one.
Considering N73? I got some opinions:
I just bought my N73 ME 10 days ago. Overall it serves me well.
This is a big upgrade for me, my previous phone is 6630. For me, it doesn't lag, the speed is ok. FYI, N73 has dual cpu 220MHz compared to single cpu 220MHz of 6630.

If u wan to see the photos taken with N73, here:
http://www.flickr.com/groups/n73/Common problem... hmm... i encounter none so far (10 days). Is this a problem?: the camera dun start instantly after u slide the camera cover, it takes abt 2 seconds.
Btw, -vip3rleon9- dai kor, u really pro at N73 lar~ Salute~

dual cpu? sure boh. From other websites it states dat n73 has same cpu as 6300 oni, but n73 is fater due to newer OS.