Reference to the cheapest camera is similar to all other things cheap. It may work, but it wont do what you really want or need it to do, and it will likely be obsolete very quick. I know from personal experience that things I have bought cheap turned out to be more expensive. I once bought some hand tools (china) that either broke, or rounded off bolts and nuts.

I bought a Palm several years ago. It wasnt their best model, but at the time I thought it did what I wanted it to. After 2 years, it was pretty much toast.
So I then bought an IPAQ (in 2004). It was the absolute most expensive one they made. I am still using it, and it does more than I ever hoped for. I have GPS moving map installed on it, it has blue tooth, WiFi, slot for SD card,plays MP3s and movies, easily removable batter pack, etc. It is a fantastic tool, that as the years go by, the price of it seems like even more of a bargain.

Part of business is knowing what tools to buy and how to make money with them.

Of course, the TV home inspector is going to do nothing but praise his IR equipment when FLIR is paying him to speak at one of their sales seminars.
The seasoned guys on this list that have tried them are your best resource. Surely Jerry can explain his thoughts. I recall he was trying to sell one a while back.