Well I have had many devices, mechanical and not, High voltage and Low, I also have had Variable Voltage mods... I have no issues with any of my purchases, and I am assuming I won't have any with this unit...
The MAIN selling points for this device (at least for me) are
1. the ability to quickly check the resistance of my atty (a big plus since an atty's resistance can change over time of use)
2. IMO the most important over any of the other feature is the voltage range you can get utilizing ONE SINGLE BATTERY!!!! I have alot of standard resistant atties (LRs too) and battery stacking for a lazy man like me is sometimes bothersome. Yes, putting two batteries in a device really isn't to hard, but keeping track of my battery pairs is sometimes a daunting task for me. (yes it is important to charge the same two batteries being used at the same time.. it's just proper battery procedure)....
anyway that's my thought on the matter, coming from an individual that doesn't have the device in hand yet
LGD