I've used Spktrum gear for a number of years in nitro and electric models and found it to be very good, and in most situations I'd certainly recommend it.
However... after putting a nice new R10 Pro speedo in my FS2 SP with a Savox servo about a month ago I've had anynumber of annoying electrical issues. I've used a number of Spektrum Rx's, with and with out capacitors and just can't (reliably) fix it. Change the servo, it's fine; change to a Sanwa Rx, it's fine; put my HobbyWing 120 amp back in, it's fine. So it does seem there are some compatibility issues, which from what I can tell are down to Spektrums' design and it's use in certain configurations, especially with high current-draw servos.
From what I can put together, Spektrum are different to all other systems in that they fire all of the servo channels at the same time, rather than in a round-robin fashion like most other Rx's. In addition the fail-safe system they use has a slightly smaller window than most others. That means they place a higher load on the BEC, especially if you use a juicy servo like a Savox/Orion/Align etc, and if the BEC votage does get pulled down slightly the Rx is more likely to failsafe (which is what mines doing intermittently when I punch it out of a tight corner). The glitch buster capacitor should smooth that out, but in some cases it doesn't seem to be quite enough.
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