is it a good buy?

Here is the link--

http://alberta.kijiji.ca/c-buy-and-sell-bikes-road-TRI-BIKE-2010-Cervelo-P2SL-Durace-Components-W0QQAdIdZ391473597

I think it is pretty obvious that if it isn't the right size then it is not a good buy...

Unfortunately not everyone understands this concept.  Looking at the raised stem on the picture tells me that the bike wasn't the correct fit to the original owner.

One thing that screams out at me is the description given... makes me think its either a scam or the bike is stolen.  It's obvious to me that the person selling the bike doesn't know anything about bikes. 

It's such a good deal is seems to be too good of a deal, which would make me cautious.

Tread lightly.... good luck.

First bad sign... there is no such thing as a 2010 P2sl. A P1 maybe, but not a p2sl, and the bike in the picture is not a 2010 of either.

move on.

Also the bike is beeing offered in Edmonton, the murder capital of Canada.

Might be a plot to find a new victim?

It's not a 2010 P2SL.  Cervelo wasn't making P2SLs in 2010.  I think they stopped P2SL is 2009 when they dropped the SL and C versions and just went with the P2, all of which were carbon.  So this bike might have been bought in 2010 but if it's a P2...it's at latest a 2008 version. 

If it was made in 2010...it's a P1, not a P2.  But I don't think Cervelo was using that color scheme then.  I think it's a 2008 or prior.