I snagged the T21 all via a sale, and it were an comprehensive steal. It's been controlling very easily, and I've been satisfied with its functionality. It isn't the strongest miner, nevertheless it really's definitely an great price for that price. Overall, the Antminer L9 is an excellent option https://antminerbitmains910752.bleepblogs.com/39748917/where-to-buy-antminer-safely