After a day and a half or so, here are my observations:
. Lacking ability to lock voltage / wattage settings means I'll either need to deal with it or get used to "5 click" power on / power off when pocketing the mod. On my iStick, I'm used to locking the wattage when I change attys and never actually power the mod off. Ever.
. I've dropped it twice so far ~3 feet to wood floor. So far, so good.
. The finish on the case is roughly the same as the iStick50, but this one feels a bit less slippery than the iStick. I'd still prefer a case / skin for it for better grip.
. Built in ohm meter jumps a bit even when cold. I don't know if that's normal or not (and it doesn't bug me in the least bit whether it thinks the coil is 1.21 or 1.23 ohms)
. If I screw my "Flat Screw Bottom" 510 tanks past "snug" to "tight", it shorts. Backing it out doesn't immediately re-register the atty. I need to either fire it or wait around 8 seconds (safety feature?)
. The manual that came with it, I think is the manual from the Defender 25W. It references a few things that don't make sense (USB port is actually towards the top of the mod, not one the bottom. There is no lanyard -- basic stuff).
. A few times (three, maybe?) I've hit the fire button and it didn't fire. Not a big deal. I'm used to this from the iStick.
. Having a center mounted 510 connector and a smaller mod leaves less room for my index finger to "cup" the mod while I hold it. This forces my finger closer to the tank and makes be block the air holes a bit if I hold it the same way I hold my iStick.
. I'm getting ~ 10 hours of battery with an eFest 2500mah battery vs. ~2 days on the iStick50.
Note my previous experience is limited to twisty sticks, MVP2, and iStick50.
The only thing above that actually irks me a bit is the inability to lock it. Perhaps there is a magical button sequence that's not in the manual that I'll just need to figure out.
Either way, I'm satisfied with the purchase so far.