Have had this chair for less than a week, so can not attest to how long it will work, but works great right now.  Totally quiet motor when in use.  The only two things I don't like, and wish I had realized before I bought it is that 
1. Leg rest only goes up when back reclines, so you can not sit up with your legs up.
2. Not much depth between seat and arm rest.  If you are buying this for someone who leans to the side, you need to add pillows so they don't fall out. 
It's okay, just not great for our use.