I've noticed a few of the dry fire button presses that also affected the 20w version but to me not a big deal considering how infrequently it happens. I never had a problem with the 20w threads but realize the less mechanically inclined did. The stainless steel threads in the 30w fixed that though. The biggest difference for me is the vastly improved voltage regulation. I am very pleased with the 30W iSticks as I was with the original 20W version despite its flaws.
If you need a frame of reference my vaunted Provaris (3 of them including a P3) are now mostly collecting dust these days. The Provaris are great devices but can't compete when the comparative form factor and performance are compared.
Yeah, yeah, yeah the Provari diehards will no doubt weigh in with all their now increasingly stale canned arguments about customer support, dependability, yada yada. My 30w iStick gives me every bit the excellent vape experience as any of my Provaris or Semovars. Personally I'd much prefer a very quirky 2015 automobile with good performance to a rock solid 1960 Thunderbird with manual steering and hand crank windows, not that the T-Bird was ever rock solid.
For the price I consider the iStick a disposable device I would never expect to last 4 or 5 years or more. Besides which, what will the available technology be in 4 or 5 years? Why spend $200 - $300 on a device now when the technology behind that device will likely be eclipsed very quickly at the pace the vape world is now moving?