The only downside is touting this amp as Class D if one is thinking they are efficient. Why? Because with the strictly regulated RIPS power supply, this amp has Class AB efficiency and is known to be a current hog!I would look into a JL Audio 1000/1 or a 1000/1v2. True 1,000 watts at 4ohm class D mono Amp. Pricey but worth it.
Just be very lerry of dealing with Memphis Car Audio products... Especially if buying them used off of eBay. Why? Because if something goes wrong with it and you don't have an original receipt from an Authorized dealer, Memphis will not even deal with you! Granted there are some other places that can repair them besides Memphis Car Audio. Sadly that is the chance you take when purchasing through eBay.