I've had my grey SX Mini for a little over a week now. Wow, i love it. The only problem i've seen so far is that my atty's don't sit completely flush. It's crooked ever so slightly. Didn't notice til i looked closely. Not a big deal really, but for the price was kinda bummed. oh well, still works and looks great. Fit and finish on everything else is spot on though. The seams where the dark grey meet the lighter grey body sits flush all the way around. Love the memory settings and the soft/normal/powerful settings are great too. I have a 0.3 ohm build on my plume veil at 45 watts set on powerful. Hits great, of course battery life isn't the best at that wattage and setting but i didn't expect it to be on a single 18650. Now i have a 1.0 ohm build on my kayfun 4 set at 16.5 watts on powerful, AWESOME. Battery life MUCH better of course set to a lower wattage. I have a 28 gauge twisted coil in the kayfun and the ramp up time to heat it up was a bit annoying. The "powerful" setting got rid of that delay and it hits like a champ.
The device is a little pricey, but worth every penny i think. I have a vaporshark rnda 30 as well and they're about the same price. I'd say it's on par if not better than the VS.