Has anybody ever used these products before? Just bought a basic unlock/lock system today just wondering the quality of them.

 

They're not bad. But as with most after market electrical additions, it is up to the installer to make a product work as designed. If you're going to put it in yourself, please don't use t taps, soldering your connections is better than that, and I've heard posi taps are by far the best for doing alarm installs. (I think napa sells these).