Yeah this is a great deal, I picked up one on Monday. It has E0 stepping and runs real cool. I'm running it now at 3.8ghz on air with 1.375 vcore with no problems. I can't get it up any higher though no matter what I tired so far. I replaced my e8500 for this and I'm very happy with it. The games I play seem to like the extra cache and it seems faster then my e8500 that was running at 3.8 too. I have a q6600 running in my wifes PC, I'm running that at 3.6 but it runs really hot and it is not as smooth or stable as the Q9550.
I did some research on the net about this chip and most people have hit 4ghz using the following setting below:
CPU Voltage 1.375v
CPU PLL 1.50v
NB Voltage 1.44v
SB Voltage 1.50v
I'm using these setting too except my MB's SB voltage only goes up to 1.3, maybe that is the reason I can't hit 4ghz yet. Also, they say beware of setting your NB Voltage higher then 1.4 because it has been known to kill some chips.
I didn't want to go the full upgrade to I7 until the MB prices come down quite a bit more. This chip is a nice upgrade if you are running a decent e8400 - e8600 because you can sell your old chip and the q9550 will only cost you about $25 - $55 after the sale.