Having used my futaba unit with no problem with its included receiver, I tried out my second receiver.
This receiver came into the store with the first batch of M8 units, so I was a little leary about buying it, but figured if I didn't get it then (before even getting my Futaba unit) I might wait months for another separate receiver.
This receiver was slightly "different" than the first, instead of binding in 1 sec, in took about 3 secs to bind. Such a "disappointment"!
On a more serious note, this Spektrum stuff is great. I am off to Cincinnati at 5:30 tomorrow morning (starting out in Milw WI) for the weekend TCS race. I am looking forward to not having to wait for a frequency clip for what might be a crowded event.
(I did stash the original 3pk transmitter module and receiver in the bag "just in case", but I suspect it will never again see the light of day.)