I started with the 510 based on recommendations on this forum and Vapeatron and have been so happy with it I haven't even wanted to try anything else. I've ordered extra batts, attys, carts, juice, various chargers including a pcc, and am still using my original 2 batteries and atomizers from my first starter kit every day. No atty cleaning or disconnecting battery at night or anything special; just mixing juice flavors and tonight washed all my cart filling for the first time. Everything just keeps on working. A girl could get spoiled like this.