I bought a diamondback DB9 and ended up selling it in less than a month. It didn't like a variety of ammo and was not consistent or reliable enough for its intended purpose (CCW).

Their customer service was difficult to communicate with and their products are overpriced.

There's your mixed review. Now go buy yourself something you'll be happy with like ChunkeyMonkey said. There are other companies that produce quality AR-15s for the same price that I would rather buy from.