Hi. Before buying the Pro, I already had 2 Eco Nanos, and after 1 year they're still working great. The batteries last all day. So I thought I'd get a Pro because it has even more battery capacity, and a cool display. Well I'm super disappointed. The Pro battary only lasts half a day! What's with that!?! I bought 2 pros and both last only half day. So obviously the battèy tech got worse, not better. Also the display sucks. It gives battery percentage on each puff, so now I can actually monitor how quickly the power fades. Ugh. And I bought it might display puffs or something else. Nope, on the left side is a decal of a specrshipnir something. Fits not actually part of the display. Just a gimmicky trick to make you think it has a large display with lots of info. Not true. In fact I believe the "battery level" display is drawing so much power that i only lasts half day. Now that's pretty f***** ironic, eh? I wish I could return them for a refund. Total waste of my hard earned money. Mark 🤙