Evolv Boards (actual makers of the DNA chipsets) are more along the lines of as an analogy buying a Cadillac, and their only real competitor is China's Yihi (SX ### boards). Both are quite comparable, and just about as accurate as each other. Most of the Evolv boards (example the DNA166/200 boards) are just about 97 to 98% efficient (power in to power out efficiency), pretty much user configurable through their EScribe software (requires a Windows install, Linux and MacOS you'll need to dual boot or use a Virtual Machine install of Windows with like VMWare or VirutalBox). Yihi chipsets follow pretty much as good as Evolv's offerings, though with temperature control Yihi uses Joules instead of a watts setting like Evolv and everyone else does, its still watts but meaning watts output in a certain time reference.
You'll see Yihi control boards in makers like Pioneer4U (IPV line of mods), Sigelei and several others use them as well from time to time. Wismec/Joyetech, Kanger, and many others out there make their own offerings, my experience they act like a base entry level Chevy in performance and accuracy compared to the Evolv and Yihi offerings, some can be good (Example Smoant or Hohmtech) where others are mass produced throw away designs (Joyetech and Kanger). I haven't been much impressed with Joyetech/Wismec and Smok's offerings lately, work great first few months then paper weights or they are using over-specced safety limits (Example Smok's Alien220w, 220watts is unattainable with a dual battery mod given the limits of 18650 batteries powering them). What you read on a particular Evolv or Yihi spec sheet and all its safety information is right there readily available without guessing nor getting yourself into trouble. Not to say Evolv and Yihi haven't had their lemons with offerings, but most of their current offerings the mod chasis will wear out before the control chipset board.
I've got DNA20 and DNA30, DNA75, and DNA200 devices still running to this day, as well as many Yihi power devices (IPV2, IPV3, Sigelei 150) still running as strong as a tank like when new, as well as some cheaper devices from Kanger and Joyetech.
Plus side to buying a DNA device, though pricey, if you find it isn't for you, there is the option to sell it second hand and regain some of the money back, there are plenty of people that will buy them off you.
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