I use a lot of stuff from walmart. I have never had any problems with them. They have really improved a lot in the past year. No, it may not be top of the line, but for the average hobby keeper, it is just fine. They have a new submersible heater now that I just love. I believe it is the Whisper brand.
I have used the aquatec filters for years. Just clean them out regularly, like any other filter and you shouldnt have any problems.