We use tatami in our dojo. They've lasted a very long time (approx 15 years so far). They do need to be refaced but the tatami itself is in generally good condition. Due to their age our tatami is a little softer so ukemi is not difficult. I've trained in Fukuoka at several of Suganuma Sensei's dojo and he has very new tatami. Rock hard and unforgiving to say the least but that is what everyone there is used to so...., if you don't have anything to compare training on tatami to it's "relative".