Hey Y'all.....and has anyone used one of these?

Hey guys!!!  love the forum (especially 'cause it clears the firewall here at work).  I’m finally back to brewing after a 3 year hiatus.  I brewed a strong stout (1.072 OG) 3 weeks ago and aside from a few rookie mistakes everything went well until after the brew session.  I pitched my yeast into my wort that was too warm and had troubles stabilizing my fermentation temps (swamp cooler method).  That being said, I found this on the net the other day.  I’ve got an extra temp controller just lying around I was wondering if anyone has uses one of these or something like it to monitor fermentation temps?

http://www.brewershardware.com/Straight-Wall-Thermowells/

I use the 16" in my fermenter, inside a chest freezer.  I squoze it through the small tail on a carboy cap and use the large nipple for the blowoff tube.  Works great!

I’ve got an ugly homemade one from the diptube of a 3 gallon keg.  I love it.  I use it in my conical siting in an insulated box I built with a window AC as a cooling source.  I brewed a bunch of beers with Nottingham earlier this year and was able to keep them at 58F fermentation temp using the thermowell and Ranco controller.