Endless Pools and Their Competitors

I am seriously considering investing in an Endless Pool. I would like to hear about other people's experience with them or their competitors (SwimEx, etc.) from various perspectives -- ease of maintenance, finding qualified individuals to fix it if something goes wrong, quality of workout for a fairly avid swimmer (1:05 100M free, 45 year old male), workout for more recreational swimmers, buying various options including dimensions and speed, differentiation amongst brands, how important it is to "take test drive" before buying, installation considerations. Any comments, ideas or other thoughts would be appreciated. Thank you.