Simple and easy to use
The price point is good for what you get. Bright color is easy to find while training outdoors. Fit well and function well.Because they are plastic, they wear easily and then you get a malfunction and have to take them out of rotation. This is due to extensive use in dry firing. But again at this price point, I am not complaining just explaining.
Good dummy rounds for price and quantity
These are good for malfunction and practice loading drills in the classroom. The orange color makes them easy to see and find, they are easy to load into a magazine, and the quantity that you buy is good for the money compared to others. One of the drawbacks that I have found is that occasionally after a while some of the rounds rims would break. Also I would not use these on the range for malfunction drills during live fire due to the plastic having a tendency to get stuck in a hot barrel.
Descent quality dummy round for training
I've used Precision Gun Specialties 9mm dummy rounds for practice as well as training others in handgun operation/malfunction drills for a while now. Overall, I've been happy with them. They hold up well enough considering they're about .50 cents each. I've lost more of these to the dirt than loosing them to broken rims etc., which make them unusable. Not as high quality as ST Action Pro dummy rounds, but they are more reasonably priced. If you think you want these, I'd recommend buying the 50 count pack. Despite being bright orange, it's surprising how they'll disappear in loose dirt, gravel, or brush.
Training aid
I got these and sent 25 to a good friend in the sand box to pass out to other guys in his unit so they could get some training done in their down time, and I kept the other 25. We both found them to be a little finicky frequently causing double feeds. I have not however had any failure to eject. The rounds are a bit smaller then a live round, this causes the seating in a mag to be just a little off too. They are a great training tool, and can be used over and over again.
Useful Training Tool
We purchased these to hand out to students for their Basic Pistol Training. Because they are orange or yellow, they can not be mistaken for actual ammo. It is an inexpensive hand out that the students will use over and over. We give out 2 rounds for semi-autos and 5-7 rounds for the revolvers. They work well with speed loaders.