IPV5: I bought one and have not really used it only because I have really zeroed into the YIHI chips and certain DNA 200 Mods however, I obviously tried it in all modes and various tanks and battery's b/c if anything wasn't working correctly I could and would have returned it. But in trying the Mod which not sits in its box (which is a shame) it was really smooth kind of like the IPV4s or Segelie 150 TC Mod but on steroids. Also in making sure that the SS function worked properly the TCR can be changed and as I am sure you know some tanks and their coils need higher TCR #'s and I thought the IPV5 was simple to use and to customize it your tank and coil to how hard you want the Mod to hit. Also being able to go over 50 Joules is a huge plus and when the SX-Pure is fully out it also has that as an option. One thing I have heard from KMG who fixes the IPVs and is a whole saler that they will be doing an update for SS as some Mods you have to adjust them considerably higher then what is recommended so I know that is a fix that will be coming if someone has an issue in SS, just move up the TCR until it fires properly and makes that nice sizzel sound