Tracker works fine but mine came with the front cross hair not in and I had to get it put into the plastic, the trigger is thin enough and the spring is strong enough to cause some discomfort while using it.

Simple to use- we use it with students as young as 6 with great success

I've used the AltiTrak for years with my physical science students at the 8th and 9th grade levels. It does require a position at least 76 m distance from the launchpad to be accurate. And students must be trained and have time to practice using it to be accurate. If you have lower level students or very short class periods, it may not be the best choice.