I have owned and used kr808's and 510s. I still own and use Joye Egos, Rivas, Kgos, e-powers, and 5 VV mods. I've used probably 30 or 40 different attys and cartos.
If you want a good, affordable and simple vape, get a kit with a couple of Rivas or Kgos. Use simple single coil cartos. Boge 2.0...