My current devices are a Riva 510, and a Hello 016. They are fine, with the freshly charged battery, but it doesn't take long for the vape to get much less satisfying. I think my mistake in early days was needing the backup. I panicked a bit, when I had charger issues, had to go back to cigs, so I ordered a whole new kit. I will still need to use them however, as we like to boat, skidoo, fish etc. and I won't be comfortable taking the ProVari along where I can drop or lose it. I'm so hoping that with the ProVari I won't need to keep looking for a satisfying vape. In fact, I will commit to buying no more devices after this. Maybe when I just need to buy supplies, I'll start seeing savings....