Just got my Twins telescoping extension for my provari mini and my initial reaction when I got it was- this is what I paid $35 for 2 little pieces of stainless tubing with some threads? But after putting a little noalox on all the threads and put it on the mini and put in an 18650 and screwed the end cap on it really felt great looked awesome and works flawlessly. I really don't understand why anyone would ever buy the regular provari with this option available for the mini. It gives you many more battery configurations to choose from plus it gives the provari that telescopic look that I love. If you can get ur hands on one (know vaperev sold out quickly and the maker is in Greece) then do not hesitate u will not be disappointed.