I've been using protank 1&2 since they came out and have been nothing short of happy with their performance....BUT I rebuild my own coils so that increases my vape quality immensely. If your planning in the future to start using RBA, RDA, kayfun, russain ect ect that require you to build coils then rebuilding protank heads will set the stage for your future building practice. Rebuilding protank heads is super easy so don't sell yourself short by suffering with untouched stock heads.
If you just planning on using the stock heads then your in for a rough ride of inconsistent, poorly manufactured coil heads that at least you can go onto Youtube and learn how to DIY the stock heads so they perform somewhat better.