I'm in the very small minority here, but my pool has 2 purposes. We swim in it for the 3 months of summer we (sometimes) get here in Ohio.
It's full of snow and ice for 2-3 months.
The leftover time is spent skateboarding in the pool.
I'm constantly worried about floating the pool, and cracking. And to you, my coping probably looks terrible. To me it looks great.
I talked to several other people that have used Hydrazzo before building it, and have a well point pump under the pool to keep the water out when it is empty.
The water costs money, and the inevitable repairs will cost money, but we get tons more enjoyment out of the pool this way.
Notice all of the skateboard parks around the country. Many of them have pools that never have water in them, and I've never heard of one floating. Nevertheless, I built it slightly differently, and stay concerned.