Ive seen them work on an Echostar AD3000 and AD3000V.
Someone I know has a (very small) Technomate machine which has no trouble, and Ive heard the Topfield PVRs are good contenders.
Ones that dont - Manhattan 2000, Manhattan 2500/5500 and Starlight 6900, Strong SRT4400/4450, and the Humax 5400 (though you can get firmware that is on par with that from the Matrix people).