So does anyone have experience with these? Pricewise seems almost too cheap to be true. $9 for one of these or $99 for a SR3500? Hmm...

Go with the ones from targethobby.com

Orange ones are very badly constructed

Cheers

you get what you pay for in this case,
the orange ones are complete junk
i have two here both unusable

the sr3100 from Targethobby works just fine. I've got 5 of them and for 10 bucks you can't beat them. They take PayPal and shipping is reasonable (8 bucks to ship 3) shipping time to the states is under 2 weeks.

Oh dear. I saw this just a few hours after ordering 2 orange RX's. I am planning to use one for VRC, so I don't have to have the car on my desk, and the other as an emergency spare for if my genuine 3100 dies. I will eventually get another genuine RX as a spare.

Will these target hobby rx's work with the dx4r pro?

Yes