I've got one and I really like it. The tank sprayer I purchased does not hold pressure well enough to use a lawn-sprinkler timer but I never really wanted or tried that anyways. Regardless, that's not a fault of the Barr's kit, but rather the quality of the particular sprayer I purchased separately.
The mistheads are very nice. They produce a nice droplet size that is not too small or large. Too small and you only get a mist but no water droplets left behind for drinking (important for many snakes and lizards). Too large of a droplet and you pump a lot of water into your cage only to produce less humidity. Large water droplets are good for some species, but then you have to deal with a lot of standing water. The Barr's produce a droplet size that is good for a variety of species, IMO.