If this thread is to be useful, people should not post only based on one-time experience... Even the best hardware product can develop faults in one in a million cases and you might have received the faulty item... So, IMHO, people should post based on multiple experiences (both personal, and heard from other owners)...
Also, the reason should be clear and not biased... For example, Dont say that the iPhone sucks if you have not used it and havent heard it from someone who has used it... While personally I would never buy iPhone, it doesnt mean that it is a bad product (it would be damn hard for it to be a bad product and still win acclaim from a lot of tech and non-tech mags)...
Similarly, I have used one Microtek UPS (for about 2 to 3 years) without problem, a couple of VIA motherboards (they may not be great performers, but they have decent price-performance ratio) and have used many Seagate drives (some for more than 10 years) without problems...
Most of the items I purchase generally are after lot of research, so cannot give any additional items from personal experience right now... If anything else comes to my mind, I will post it later...
Arun