Great product, with one annoying flaw, but still worth the money!
I recently used this lifting device and the battery ran out while it was lifting.  I was trusting the battery meter to tell me whether it was holding a charge.  All 4 lights lit up every time I pressed the button,  so I thought it was fully charged.  Then, I had to use it, It filled the bottom cushion fully, the second one to almost, then the battery ran out.  It managed to eeek out enough lift to be useful,  but I had to do the rest of the lifting.  The battery display should give me an idea if the battery is low.  Also, the charger should be powerful enough to either fast-charge the unit, or power the system while running, so that, in a pinch, the user can plug it in and get full performance.<br /><br />Overall this product is great,  it works well, and I tested it on myself before having to use it.  It is worth the money, but it is probably best to leave it plugged in, so you are not fooled by the battery level meter that isn't accurate.
Rating: 4 stars