I bought a Zoomed Hygrotherm a couple of months ago (January, I believe) and have been disappointed with it. Besides not being able to bury the probe in the substrate, I also find the display very difficult to read unless it is at precisely the correct angle. Speaking of the display, it is a separate from the unit that the heater/fogger plug into; this seems to translate to more cords (or, at least it seems that way--just makes the whole device a bit more unmanageable). In addition, the display can only display either temperature or humidity at one time, not both. It also does not have up or down arrows to set the temperature or humidity; instead, you must cycle through all the degree/% settings (it counts upwards). Consequently, setting it can be a bit time consuming and somewhat of a pain.

Last week, I ordered a Herpstat 2. I actually bought the Herpstat because I am switching from two 40 gallon tanks to a single Animal Plastics T8 with a divideer and, thus, needed two thermostats. However, even if I had not gone the way of the T8 and was keeping the T8, I still probably would have switched from the Hygrotherm to a Herpstat. I might use the Hygrotherm to measure and regulate humidity in the T8 (I have a Reptifogger that I bought when I purchased the Hygrotherm, but I am not using the Reptifogger now because it required too much distilled water.). We'll see, though.