My 1tb seagate barracuda 7200.12 was dead (used only 3 months), and so I went to RMA centre, they took it, didnt even check that drive, they just said that I will be getn replacement drive within 20 days. I waited for almost 2 months, after that I got a call from them to pick up my HDD from that centre. I brought it (certified repaired hdd), used it hardly for 6 days, again it failed. I again went to rma centre, they took it, noted it, and said 15 days. This time I got a call from them in 15 days and I got my 1tb repaired certified hdd. To my surprise, this one also failed within 1 week. So its still lying in my house. I wont bother to RMA any hdd in future. So i purchased a new 1tb hdd and using it since 6 months, works like a charm. No probs yet.
I cant comment on your situation, coz LUCK is also a factor which plays very imp role in HDD issues
If you are lucky and have got a good replacement drive then its bound to work fine for several months or years... but depends....