I used ProVaris for a year and a half. At one point, I had 6 of them. I'm now down to 3. In reality, I only needed 1.....they never broke. I dropped one of them out of a 5th story window of a building I was tearing down. The window section of the Kayfun was the only casualty. The ProVari fired right up...I was only slightly surprised. The ProVari doesn't quite fit my needs anymore. I like a little more power in a regulated mod and I prefer a box style these days. In reality, I use a Reo Grand about 90% of the time.
But, if the ProVari does what you need a device to do, then I think you'll have a hard time finding a better one. ProVape has the best customer service in the business but chances are slim you'll ever need them for anything. So, yes, the ProVari is worth every penny, if you have the pennies and if it fits your needs.