Alpine M500 - used for 1 year and sold it
Alpine M500 - used for 8 months and power supply went out, warranty exchange, used for 6 more months and sold it
Phoenix Gold RSD300.4 - Used for 3 yrs no issues
Orion Cobalt 600.2 - Used for 2 yrs bridged @ 2 ohms no issues, gets hot every now and then if you play it full tilt.
Audiopipe AP1500.1D - Used for 3 yrs @ .57 ohm nominal beating the **** out of it and no issues yet
Audiopipe AP1800.1D - Used for 1 yr and sold