I wasn't aware of any issues when I bought mine, and haven't had any. I have a Verizon 10.1(2014), about six months old maybe(?). I have never had a problem with the LTE speed. I stream Netflix, TiVo, and HBO-GO all the time; no stalling, streams perfect. That's my measuring stick for speed & stability on any device... can I stream without issues. Yes.
What problems were others having?