I also use the PinPoint pH meter, and overall I like it quite a bit. I leave it running at all times, just so that I can watch overall trends.
Be aware that when the battery starts going out, you will likely get very strange readings. Look for the "LoBat" indicator if you ever get a very strange (like unusually high) reading.
At one point, I had changed my dosing methods and schedule at around the same time that my pH meter's battery died. Over the course of 3-4 days the meter was reading steadily higher, and at around 8.6 (in the morning) I decided to panic. I was convinced that my new dosing method was screwing up the tank, so I launched into all sorts of antics trying to get my pH back to normal. As you can imagine, it didn't work

Keep in mind that the strangest part was that the fish and corals looked great!
After practically having a nervous breakdown, a friend suggested using a standard test kit. Well, I did, and I am sure you will guess the rest.
Having said all that, I recommend this meter as it works well, but it is nowhere near as important as simply watching your tank and admiring the pretty corals......