I'll have to keep an eye out. While the RF features are nice, when the price is a third of the new one, I can live with the compromise (and I have been happy with mine, although the biggest complaint is the requirement to keep it pointed for 5 seconds or so (I reduced the timings to shorten the time from their recommended ones as well).
I haven't looked at the older ones enough to compare the functionality, I know they don't have color screens (gasp!). Looks like there are $50 rebates for a bunch of models now. For a secondary remote (guest bedroom, kitchen, etc) might bring the cost down to be worth it.