This is a fantastic bong, and way cheaper than what the manufacturer sells it for ($165 MSRP). The hits from the frozen glycerin coil are extremely smooth almost equivalent to just taking a deep inhale outside on a cold winter day, rather than a hot, harsh nasty smoke rip from a normal bong. If the coil isn’t frozen it still hits great, with equally smooth hits just minus the nice cooling effect. I recommend cleaning the coil each time before freezing it (seems like common sense, but trust me) as if any slight piece of residue is left in the coil freezing it makes it impossible to pull from because the frozen residue is clogging it. Make sure to clean this thing really well I bought a flexible pipe cleaner on Amazon just to make sure I clean it super throughly for cleanest and best smoking experience. Other than that this thing is very easy to clean and I couldn’t recommend it more!