I switched all my radio gear to DSM-X prior to last year's FliteFest.
This year, I flew my ORX equipped Versa and Storch on Wednesday night without any trouble. Both experienced lockouts on Thursday, but were recovered in time to avoid a crash. I didn't fly them after that, opting to repair and fly my Nutball (ORX) instead. The Nutball went down in the bean field three times and I had a heck of a time finding it, but I did each time. It's still in working order.
I flew my blue Spitfire several times on Friday and Saturday without any issues. It has an AR610.
I didn't fly my MiG, but it is equipped with a Spektrum receiver. I didn't completely trust my ORX gear before this, and now I don't trust it at all. I have 4 receivers that I will probably use in cheap, easily replaced, or crash-resistant stuff, but models I put a lot of time and effort into will get 'real' DSM-X receivers from Spektrum.
I agree with ZoomNBoom that it would be good to ban older radio gear. As much as I would hate to see someone not be allowed to fly, it would help assure a decent RF environment for everyone else. And of course there is the safety aspect to consider.