I am using an MDG computer that I bought 2-3 years ago. I have only had an issue with the monitor (Philips). I was reasonably satisfied with MDG when I bought this PC, but I found that they tend to nickle and dime you to death if you get lured in by the attractive "FREE UPGRADE TO..." advertising. Like I was.
The system advertised did not include an ethernet card (required for surfing the net), and a couple of other user experience enhancing parts. These were all extra cost. The FREE printer, camera, etc, etc, were all mail in rebates, so I would have had to pay the up-front cost and waited for a refund if I had taken them. The extended warranty only covers the PC tower, nothing else. My Philips monitor crashed 2 weeks before the warranty expired on it, and it took 1 month before they decided to replace it. Thankfully they have a repair centre in St Laurent, so I didn't have to pay for s/h. The parts used inside the computer are actually fairly good quality name brands, but tend to be 1-2 years old in design.
I went back to MDG about 6 months ago to buy another PC, primarily for gaming, and could not have had a worse experience. The advertised system needed so many upgrades to be reasonable, it more than doubled the price. The technician I was dealing with could not have been more rude in the way he talked, not only to me, but to other clients as well. I may not be a computer genius, but that's no reason to treat me like I'm 4 years old. I, personally, don't appreciate being laughed at to my face, when I'm considering paying good money for something. After a nice "F@ck you very much!", I left and went to Future Shop (I know, I slammed them in another thread) and bought one of their bargain systems. I had the add a few improvements and still came out with a far superior machine at a better price.