I bought my car from Auto J Mart (or AJM) about 15 months ago and I have no complaints. I have done 30000km since then and haven't had a problem. The only money I have spent is on fun stuff, and thats the way it should be.
But I will say, like all sales people you still have to watch them. They are there to make as much money as possible and at every opportunity they tried to get me to sign on the dotted line before they completed the things I asked for. Thats normal though. Just do alot of research. I only wish I knew then what I know now, it would have made purchasing, and more importantly bargaining much easier.