I could not find a bad review on the Thermapen anywhere but found many other brands comparing their product to the Thermapen. That makes me feel pretty confident the Thermapen is worth the money.
Just be sure to test its accuracy and recalibrate if necessary. After having read all the good things about the ThermaPen and having already had the far cheaper RT600C, also from ThermoWorks, I figured I'd buy one for the most accurate readings. Well, tested it with boiling water against my lab thermometer and the RT600C. The ThermaPen simply would not give a 212 reading, kept reading 209 or 210 (can't recall exactly) while the lab and RT600C both read out 212. So, I returned it. At the time I didn't know there was a way to re-calibrate them as the switches are in the battery compartment. I found out later. Strange because the info appears to be in the instruction booklet but I didn't see the calibration info. If you need it, here's the PDF:
http://thermoworks.com/pdf/user_manuals/Thermapens/Thermapen_Splash_Proof_Calibration.pdf
Rev.