Pinpoint Ca Monitor Question

How good are the Pinpoint Ca monitors? Does anyone have one and is it worth the money?

I can pickup a used one for really cheap, just wondering if its worth it or not!!!

 

I have one. Bought it new...it works well and gives a good reading but still requires as much, or more, time than testing with a good, reliable titration test kit. basically, the probe has to be soaked in two calibration solutions nearly every use (unless you very often) which takes 5-7 minutes before you can test your tank water.

I use the test kits most often and use the pinpoint to double check every now and again.