I've used the TX-1000 and MX-900 (that have new RF transmitters) with both the MRF-250 and 300. Didn't notice any difference in usable distance between the two. I wasn't able to get any further away from the MRFs with the TX-1000 than with a 950 or 850 (about 80'), but I was also going through two walls.
Mike
www.SurfRemoteControl.com
