I recently bought myself 2 packs of these to try them out after hearing several good reviews about them.I have been using them on my Zmax V2 running them between 9 and 11 watts depending on the juice.I was really surprised with the pure clean flavor and loads of vapor these put out from the first vape.After using them for a few hours they improved even more and I gotta say I love these things.The flavor is as good as my 510 and 901 HH357's if not slightly better.I also love the easy draw on these and even after vaping for days with them they do not tighten up on you.For now these are my new atty of choice and i'm anxious to see how long they will last.If they hold up for a long time I won't be buying any more HH357's that's for sure.I have about 50ml of juice run through each of the 2 attys i'm now using with no signs of performance or flavor dropping off yet.Do yourself a favor and give a pack of these a try.Later guys.