Okay, I'll chime in a little. I have the Exocet with KFV5 1.6 MTL pin installed, the Doggy with MTL kit, and the Insider.
All are made very well, no surprise there. My favorite is the Exocet, followed by the Doggy, and then the Insider.
I'm pretty much a strictly MTL vapor and closing down the air from the outside is not the same as restricting the air exit hole inside the chamber. The Exocet and Doggy were unusable to me until I installed the KF pin on the Exocet and swapped the MTL pin on the Doggy. The Insider does provide a tight draw with the adjustable airflow ring but the way the air hits the coil not the same. I don't know if it's the velocity or what, can't explain it, but there is a huge difference between air exiting a 1.6mm hole and air exiting a massive 2mmx6mm (not exactly sure on dimensions) even if the draw feels the same. The flavor is good on the Insider but I don't get the velvety smooth density I get with the Exocet or Doggy. That is not a knock on the Insider at all. It's just my vape style/preference does not seem to match the Insider.
Anyways, just my opinion. Take it for what it is.