We just did a disc brake conversion on our 36' fiver using Kodiak disc brakes, the Hydrastar brake actuator and Tekonsha Prodigy P3 brake control last month.
The difference is truly staggering. Ironically, within a month after doing the conversion we were in a really close near-miss rear ender when a car cut us off and then stopped right in front of us.
If it weren't for those brakes, we'd have had a really bad accident.
I took lots of pics of the installation and put some notes about it all on our website if that's any help to anyone here:
Trailer Disc Brake Conversion - Upgrading to Electric Over Hydraulic Disc BrakesBTW we haven't noticed any delay when applying the brakes...