+1 agree. It does seem cheap. If maybe it was twice the price it might be worth considering, but I would be a bit worried of the design and fit. The CP-E downpipe can be an issue to fit (but that's primarily down to getting the stock DP out) I have the CP-E installed on my car as does a mate of mine and a few other guys on here. No problems and it's all legal and catted etc. You may get a CEL just after installation on first cold start since install but after that they're generally all good. Not sure if you will find many people to offer feedback on the particular DP mate. This is the one I have installed on my car, which is currently on special (also if you wish to see pics/info of a MPS6 exhaust, let me know)
mazda-6-mps-exhaust--cpe-down-pipe