I have not run into tamper proof hydrants, but then we don't see kids wanting to play in the water from a hydrant much here.

I did run into an issue with a "quick connect" type fitting, but that problem has been solved also.

Sons #1&2 hate the set-up. I usually use them as labor when we have to go wet down a site before/during/after excavation. They get the leg work laying line, I get to squirt them when they walk up!

One must look for the small treats in life....