Polder is not a bad deal at $15, but is not nearly as small as the best of the Thermapen offerings. The size of the "needle" is very import for several reasons:
Small tip leaves tiny hole so that delicate foods are far less marred/lose less juices.
Smaller tip has less mass to cool down food, reads MUCH more quickly.
Smaller tip is more accurate, as less "averaging" is going on inside the sensor.
Personally I love to have the Thermapen offering that is combined with the IR (non-contact) thermometer. Great way to check the surface temperature of cooking surfaces (grills, ovens, griddles, woks) as well as cooling units (fridges, freezes, drink machines.
Of course all this fun is a bit pricey, but it is WAY more flexible :