Entirely agree with this. My spinner upgrade was a Vamo V2. I was pretty happy with it, even though it shipped with a ....y button. The finish wore pretty quick and I quickly noticed the threads really sucked. After a while it started misfiring and I decided I had the money to drop on a Provari. It really is night and day. Provari is solid, provides a more consistent vape, looks better, nice threads. I wish I had purchased this before wasting any money on the Vamo. Why are the threads in the Vamo 510 connector so bad? They are really shallow and the well is too wide.
If you do have a Vamo, get yourself a 510/510-ego adapter and leave it in the well as you don't want to wear those threads anymore than you have to. It's a good idea for any mod/battery as something will eventually leak and it's better to have it in the adapter well where you can clean it rather than in the battery well.