I wouldn't buy it, based purely on the fact that my 360 has done nothing but gather dust for about two years, and only ever gets used when I want to do another playthrough of Shadow Complex.
The PS3 had its ups and downs, but I ultimately found it to be the better designed, better laid out console and I actually found features like the Blu-Ray player useful, as opposed to the 360 forcing Bing down my throat.
I also like the fact the PS3 doesn't charge me money to use features completely unrelated to it, like Netflix (seriously, Microsoft can just fuck off, for that one.)
All in all, I think Sony have the stronger track record and, when I do finally get round to buying a next gen console, I will be pitching my tent in the Sony camp; barring any major fuck ups.