I got my 1300 Riva kit on Friday, and I am impressed. I've been a dedicated 510 user for well over a year, and I'm used to 4-5 battery changes a day, charging the PCC every night, replacing batteries every couple of months, etc. With the Riva, all I carry is 3 or 4 filled carts, and I'm good ALL DAY. Honestly, I must admit that I was reluctant to try a "fat" battery, because I was still hung up on my PV looking and feeling like a cigarette. Once I made that mental jump to "This is NOT a cigarette," my life has become much simpler. I really enjoy the freedom of an all-day battery. So much less to worry about and prepare each day. I only hope that these batteries will last longer before they go TU. I can only assume they will, since they are subject to far fewer charge/discharge cycles than the smaller 510s. And it's really nice that I can still use all my 510 atomizers and carts. GREAT product!