It should be fine. I've bought several notebooks, ram sticks, a HDD and a couple of mopo's there. Always seem to get pretty good deals & so far everything's gone great.
Just pay attention to who you'd be buying from. Make sure their feedback is positive, that they have a good amount of feedback and that the feedback is for selling stuff like what you want to get (like computer parts). Make sure they're not just selling 50cent pairs of socks or some other crap in order to build up a false reputation.