I started out with the KR808D-1s and still love them, the only down side is the battery life for me which is why I bought a couple of eGo batteries and thread adaptors. In the general day to day I use the 808's and recharge either through the mains if in the office or at home or with a pcc when out and about but I always have my eGo's with me for emergencies or if I know I'm going to be out for a few days. DH keeps suggesting a box mod but I'm still learning and don't have the confidence yet in myself (or the knowledge) to move up yet.
Do what works for you