Diamond back is a less known AR. If you are shopping for a complete AR, there are better known reliable AR's for the money. Not to say diamond backs are bad rifles, but shop around. Right now Colt's are going about that price if you look around, and they are a solid AR with a high return if you want to trade or sell.
"Democracy is two wolves and one sheep voting on what to have for dinner.
Liberty is the well-armed lamb contesting the vote." - Benjamin Franklin