I've currently only tested in the air with a GoPro 3, and on the ground with a DV camcorder as the source.
Ringing is often a problem with the RF link like mismatched impedance or video level.
I took my HDMI converter apart and it interestingly uses a set of fairly simple chips with available documentation, that are all configured by a socketed microcontroller over a single I2C bus. If I find time I might try to take the uC out and replicate / optimize the config using an arduino to see if I can do things better by forcing a particular well suited mode.
The T1/T2 are definitely way above anything I've tried (includes at least a dozen models over the years). Just need to get them to work in out setup...
In the meantime they proved to be awesome as a monitor for a Cineflex shooting last week