I haven't had the pleasure of trying the REO Grand VV but my standard Grand is amazing, also something you may check out. Sometimes the simple things in life offer the biggest rewards 
GL on the search, I bought a Provari a couple days ago but haven't received it yet so no comment. I've used a ton of mechanical mods and to me VV/VW is nice but you can easily accomplish most of the same effects by simply using different resistance atomizer/cartomizers. I think my end game device might be a premium mechanical mod like the Chi you with a rba atomizer I can tailor the resistance to my liking. There is something to be said for not even needing a warranty because it simply is build to last forever. 80% of your positive vaping experience is determined by finding the right atomizer/cartomizer to use, 19% is the size of the battery, and 1% is how pretty it is. 100% of your negative experiences will be due to malfunctioning devices, down time due to constant maintenance or fiddling, or just having a bad combination of the positive things
If you are wondering why I bought a Provari if I'm such a mechanical mod fan, I would say why not. Doesn't hurt to get a nice VV mod to use and you really don't want to take super premium devices out and about if they are hard to get and super expensive.
GL on the search, I bought a Provari a couple days ago but haven't received it yet so no comment. I've used a ton of mechanical mods and to me VV/VW is nice but you can easily accomplish most of the same effects by simply using different resistance atomizer/cartomizers. I think my end game device might be a premium mechanical mod like the Chi you with a rba atomizer I can tailor the resistance to my liking. There is something to be said for not even needing a warranty because it simply is build to last forever. 80% of your positive vaping experience is determined by finding the right atomizer/cartomizer to use, 19% is the size of the battery, and 1% is how pretty it is. 100% of your negative experiences will be due to malfunctioning devices, down time due to constant maintenance or fiddling, or just having a bad combination of the positive things
If you are wondering why I bought a Provari if I'm such a mechanical mod fan, I would say why not. Doesn't hurt to get a nice VV mod to use and you really don't want to take super premium devices out and about if they are hard to get and super expensive.