I've had my DX8 Gen 1 for a bit over 3 years and I've never had a problem with it. I'd love to upgrade to the DX9 Gen 2 because of the wireless buddy system but there's nothing wrong with my DX8, lol. I've been using Spektrum gear since I started with flying rc's, about 5 years ago. There are reports of people having brown outs with Spektrum so they switch to Futaba. I can't give any personal opinions on Futaba because I've never used one but I know of many people that use Futaba and love that brand.
From my experiences with flying rc planes (store bought and scratch built), rc helicopters, and a few multirotors, my DX8 has been great. I like the comfortable feel that it has in my hands. The gimbals are smooth....it just works.