I'm using the Lumagen Pro HDP with my Mits WD-52725 RP, so yes these scalers can be used with RPTVs.
My main interest was to be able to fully calibrate my Mits and improve the SD signals from D*. The Lumagen allowed me to do both.
The Mits does not have the service menu adjustments that allow you to completely calibrate to D65 and the Lumagen does have the test patterns and adjustments to get you the rest of the way.
I feel it definitely helped my SD signals from D*, they are tolerable to watch now.
Any processor, in the Pro HDP price range should help in this area as well.
That's my $.02
My main interest was to be able to fully calibrate my Mits and improve the SD signals from D*. The Lumagen allowed me to do both.
The Mits does not have the service menu adjustments that allow you to completely calibrate to D65 and the Lumagen does have the test patterns and adjustments to get you the rest of the way.
I feel it definitely helped my SD signals from D*, they are tolerable to watch now.
Any processor, in the Pro HDP price range should help in this area as well.
That's my $.02