I've had my rDNA for 5 days so far and like it very much. Running ProTank 2's without any issues. I'm vaping at 8 watts currently with 2.2 ohm. Not into the more advanced tanks/sub ohm yet, but I'm reading up on the subject.
Small correction for the owners manual:
To lock the wattage a setting, you have to press the + and - buttons for at least 5 seconds or more. The display will verify lock mode. Same goes for the rest of the settings. Button(s) must be pressed for at least 5 seconds
The owners manual says to press these buttons for 2 seconds, but really needs 5 or more seconds.
The OLED screen is easy to read and auto dims when the trigger is not pressed. When pressed, the display gets twice as bright. If left unused for more than a few minutes, the display shuts off. There is stealth mode that kills the bottom display, but the blue LED around the PTV button still lights up. The clear cover over the OLED screen appears to be decent. Better than average cheap optical plastics.
The ohm meter seems spot on. My VTR would sometimes give false (?) readings. rDNA seems spot on with ohms.
I went with the bigger VTC5 2600 mah battery for a small upgrade charge ($10) which so far seems to be lasting longer than the same battery in a VTR. Was told to be careful if I change batteries because inserting the battery the wrong way will destroy the rDNA. There is a battery image inside where the battery goes so it would be hard to screw up and put it in backwards. I'm sure some people will do this.
So far, I'm impressed with the rDNA.