I still use mine too. As long as you're just recording OTA, the PSIP-based program guide is enough for your needs, and you don't need to offload recordings, a working DTVPal is pretty hard to beat. Occasionally one craps out, but for the most part, they'll keep working as long as the electrolytic capacitors and the hard drive are good and there are ATSC 1.0 stations to record.
The firmware has proven quite resistant to hacking, though, so unofficial enhancements continue to be unlikely.
OT: If I were going to spend time trying to hack some DVR's firmware, I'd probably pick one of the cheap Mstar-based boxes. True, they don't have Ethernet ports; but their firmware is nowhere near as well protected as E*'s firmware, lots of folks (presumably including a few hackers) have one, and if you brick it, you're out $35 tops. But I haven't seen much even about hacking those.