I'm running the Traxxas 2.4 Link Tx/Rx's in all four of my R/C's. Not because I'm a traxxas fan (note, I do not own one Traxxas!) but, it's inexpensive, has all the features I need/want, and get's the job done quite nicely.

Brand new Rx's are only $45 shipped to my door, which is great. I've got the 3-ch Tx which is great for my XXL (I use reverse) and in my other R/C's the mini Link Rx is nice and small, fits into tight spaces and doesn't take up much room.

All in all, very happy with it. Oh, and it has TONS of different features that I don't even use. Might want to look into them if you're considering a purchase...