I've personally owned an Iraggi for almost 3 years and only had good things to say about them. CS for me was always very good, seems like it was hit and miss with them though from the many other bad reviews. I've also owned a Mechman for like 2 months now and also only good things to say about them. I've had great luck with both companies and will continue to back either one in the future.
That said I've never heard a single back thing about DC Linc, Power, Powermaster, or Ohio Gen so i wouldn't hesitate buying from them either.