Never had problems with most Smok products I have and have used a lot of them, many of my mods are smok, tanks, and coils too. While I've mostly gone to dripping and squonking now (The Rage!) I didn't like the baby versions of everything, pointless and burn out city for sure, tiny and just pointless I thought, small coils were ok when I was quitting smoking. The V8T10's are the best coil of theirs I personally reckon, and a nice big tank to go in. Regarding the Prince range, very good but I haven't found the life span vs a t10 to be as good. Great tanks the Prince tanks best coils probably found to personal preference on vape volume and wattage preference. The new V9 Max stick is very impressive by the way, I always wanted a good stick the rest were rubbish until that. I vape the V12T10s and find them the best and worth the while. Will vape on those up to 100 watts depending on juice on top of the TPriv 3 or Alien. I think you have to play around, try different ones, until you find the ones you like. I try to keep a stock of 3 - 4 different coils for the same tank to find the best one for what juice. Anyway, enough of my speech, I recommend the V12 but that's just me! happy vaping!