Been using hydrology for half a year and i am mostly satisfied. I've brought it on my trips to Amsterdam, Italy, Paris and around my country. It safely passed every check (packed in luggage) in airport and in museums when it was in my handbag. My advices to other users: 1) Don't put too much herb and don't pack it. Just fill the chamber up, don't overdo it. Otherwise it won't combust properly and you won't get smoke, flavor or effect. 2) Be careful with both plastic and glass tubes - they break easily. Do not put too much pressure when screwing the top. Don't drop it (obviously). When travelling - use only plastic tubes and put the device inside the case if you bought it. 3) Clean the chamber after every use. Clean the device after every use or at least after a few. You have to disassemble it completely - water gets inside main column and under the metal sleeve. Thankfully all the electronics are sealed off and almost waterproof (excellent design choice btw). Silicone parts absorb the smell and become orange over time. Nothing can be done apart from replacing them and i wish they sold new ones. Chamber also inevitably gets darker and uncleanable (could try solvents used in bong cleaning). Vinegar also helps with cleaning metal parts and tubes. 4) If you fill the chamber completely and use first 2 temperatures (blue, yellow) - you get about 4-5 sessions out of the herb inside. As in - you can heat up the herb 5 times before the taste becomes bad and it burns out. By this time the herb will be dark brown colour and you could collect it if you want to make tinctures. More than that and it simply turns black, tasteless and doesn't have any effect. As far as i can tell - it ends up being a little less economical than traditional methods of smoking. It would've been better if "the session" (amount of time the device is green and keeping the temperature) was much shorter - 30 seconds, instead of 2 minutes so the herb wouldn't burn out so quickly. Other than that - it works fine and i actually like it. That said all my friends who smoke normally didn't like it. They say it lacks the "punch" or "punishment" but as a non-smoker for a while i was coughing quite a lot until it suddenly stopped. Smell is better, though still very distinguishable and noticeable, so the device should only be used where it's permitted.