However, you still will have cheap plastic manufactured pieces to live with

Poorly designed and made of the cheapest plastic.

In addition, the pager is made of hard (read - possible too easy to crack) plastic, and the couple of times it's fallen from my belt, I've worried it would break

The call buttons must be taken apart to install the batteries - and it's almost impossible to pry the plastic apart.

It is loud and works any where inside as well as

I can hear it anywhere in the house as well as on the deck

It's been used and worked exactly as it was supposed to.

Transmission is between the button and receiver, does not rely on some outside cellular or wifi service, works exactly as we need it to, and is reliable and simple.

It works great - I like the door bell option for during the day and the alarm will wake the entire house at night.