I've had one for over 2 years and love it.  Great for exercising in the winter. Have it hooked into the 56" HDTV and it is awesome.  My grandkids take it over when they come and play sports, primarily tennis, on it to the point where they work up a sweat.  Also they are slowly getting through the latest Zelda game.  In addition, we use it to watch Netflex movies.  One caution:  Make sure you have plenty of room, swinging those handhelds can get violent and cause nasty injuries if someone gets hit with them.  My 6'5" SIL darn near took out an overhead light playing tennis with his son.
BTW there is a new handheld coming out that is supposed to increase control--have two on order.  Already have the 2nd generation with the motion sensor.