I'm looking too. I currently have a 20 watt iStick that is crapping out after 3 months. The 510 connection is messed up, I'm guessing because of the non-spring loaded connection. I think people are gonna complain about the 20 watt iSticks soon, especially if they use them every day. First off, the 30 watt came out like 2 weeks after I bought mine, and now 3 months later and I have to fiddle with the connection to make it work with a few tanks. Also, I think it runs hot. I was looking at the MVP 3.0, (sold out everywhere) but I'd be down to get something that goes up to 50 watts as well. I just like being able to charge with a USB chord instead of having to buy a battery and battery charger, etc.