I purchased a DTVPal ("Pal"), and it does work excellent with my Showstopper. As much as I dislike DISH as a company, this is a quality product. Easily the best CECB that I have used (and I have setup 5 different models, and read ~thoroughly~ about almost every other CECB that exists).
You can use the standard DISH 0775 IR blaster code, and all functions work great. In fact, using that same code with any Universal remote (under the "Satellite" button) allows you to control the DTVpal with your universal remote.
My previous experience using a Digital Stream 9950 with my SS was less-than-satisfactory. The Pal is the opposite. Channel changes have been much faster and reliable, the Pal's tuner is MUCH better than the DS 9950, as I have gained 3 channels and the others show approx 10% stronger signal, and most importantly, I was getting semi-frequent Blue-Screens with the DS 9950 playing thru the Showstopper. None with the Pal. The DTVPal runs cooler, is smaller, and executes all of its functions much faster than the DS 9950.
Potentially, you can manually tune sub-channels with the DTVPal, as any code that starts with a "0" is attempted to be interpreted as an attempt to directly tune a subchannel. Thus, "0022" is 2.2. "22" is interpreted as 22.1.
Now, this does NOT work with the Replay programmed as having DISH service. Entering, for example, "0132" (and wanting channel 13.2) is sent as "132", and is interpreted as 53.2, which I suspect is just the DTVPal tuning the highest number OTA channel in my area, since 132 is obviously invalid entry.
The Pal's Timers function is enough to satisfy my needs to record subchannel programming, at least for now. I have read that some DTVpals have timer quirks, but I have not had any issues. I seem to have the latest shipping firmware, maybe that is a difference.
If Replay would be willing to support one or two CECB's, the DTVPal would be its best choice. The DISH IR codes are already in all of their boxes, and it does interface smoothly. If we could just get a full OTA DTV channel guide, this combination would be excellent.