About 10k puffs into a Mirage 75C; really great mod. The finish is top-notch, and love the resin and low weight. Single battery doesn't pack as much punch as dual, but you can get a good 2x700 battery with a high mAh rating. Only issue with the mod is the battery door: I dropped mine and the door split open. It's held together by double-stick tape and two tiny plastic clips. Removed the sticky tape and used epoxy to reseal it, and it's good as new, if not better. Well worth it!