I must admit I bought one last year and used it quite a bit when I used my drum but since I got my offset I don't use it at all. Even fired the drum up last night and still didn't use it. I have went through two chamber probes already and have a brand new chamber probe in the cupboard. Three so far
good news I haven't paid for any replacements yet.
Once I got used to my smokers it rarely if ever gets used any more.