i got my XBox360 used back in April 2007. so far it's still working BUT i put a 'Nyko Intercooler EX' (don't use the original ones as they seem to have issues with melting to the console etc) on it not long after it got it which helps cool it a lot better than stock cooling does (although noise levels increase quite a bit). although nowadays they make even better Intercoolers, ones that don't draw power from the XBox360's PSU, which are called 'Nyko Intercooler TS'.
the proof as far as cooling? , you can touch the sides of the system when it's running for hours and it's noticeably cooler to the touch vs without it. that's proof enough for me
but the whole XBox360 vs PS3 thing... ill take a XBox360 over a PS3 anytime. because reliability issues aside, i think the 360 is the better system because it's got better games (i.e. Forza 3 etc ) AND it's modable (i.e. can play burned games you backup from original discs)
but the XBox360 does have a fairly high failure rate, especially on the older consoles (i.e. 2005-2006 and maybe some 2007 ones) it seems like i have or older. but as far as i seen the newer models seem at least somewhat more reliable although i have not seen any strong articles saying that there more reliable as they have not been out long enough to see if there more reliable but if i was getting a XBox360 nowadays i would try finding one with a Liteon drive in it (maybe BenQ at the oldest) since those seem to be the most reliable as there newer. the Hitachi systems i would avoid if possible since the Hitachi drives, regardless of the systems reliability, are just junk drives vs all the others (i.e. Samsung/BenQ/Liteon)
xbox is not good. Pc is better
ill agree with that if your talking about first person shooters , since i strongly believe it's much easier to aim at stuff and track it on screen with a precise mouse vs a analog stick which is much harder to track stuff on screen when your trying to shoot it.
but for other games besides shooters i like consoles better. but in general, most of the games i play are shooters so the PC is best (i pretty much cannot play shooters on consoles at all due to it being to hard to aim to the point i can't really enjoy the game at all in most cases)