I bought the IQ110 around Christmas via Amazon and I like it. You can read my review on that site. My only issue so far (yeah, it's basic, I knew that going in) is that it was struggling keep temp in my WSM 22.5 when it was punishingly cold outside. I knew I wasn't getting industrial strength, but I did have to go check it more often than I'd like, and tweak it more often.
If you're playing with some overnight cooks on a UDS and don't want to jump fully into the high cost of the Guru, give the 110 a try, I'd recommend. At least then you'll know how much you use an ATC and whether you like it, find it convenient, etc., before you make a bigger investment.