I have a protank and it's ok. I have had better luck with the vivi nova(smoketech and vision) and the iclear30. if you need glass for your juices then smoktech makes a pyrex 3.5 vivi that comes in various colors. it is much cheaper than the protech and just works better for me.ymmv. I have never had a single problem with the vivis. the coils are easy and cheap to replace(just wish the vision and smoktech coils were interchangeable-they're not). they never leak on me and seem to last awhile. even the plastic ones have replacement tubes for cheap swapping. for someone who has neither the time or inclination to build or mess with wicks and coil wire they are a comfortable and sure way of vaping. for me, if it were too much harder it wouldn't be enjoyable any more it would seem like work or a really hard hobby, and I have enough of those already.