I had s970 for a month.
It's not that buttons are faulty. Everything was built with very poor quality. The buttons on the side of screen are too small. I mean, I could even close my eyes on that one, but not on how bad the keyboard feel is. One of the worst once I ever tried. Especially considering the price.
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MIKIMIKI
TYROS 5,BEHRINGER X32PRODUCER,YAMAHA DSR112,JBL PRX618s XLF,EV ZLX12p,SENNHEISER E945,....ETC