I was looking at the Freden model just because it looks ultra-portable.  However, I'm a little wary of having to lift the unit away from the fire to check it in fear that my pan would fall off the rack into the fire, ground, etc...

I think if one drills a 3/16" hole in parts he wants to heat check, a candy thermometer would work well.  After awhile though, it wouldn't be necessary because I'm thinking this is a "feel" thing.