Well I went to the office and got the newer DCH-3416! It still has the plastic wrap on the front panel
Ascetically, a much nicer looking piece of equipment. I like the button arrangement, the white LCD and the flat silver/black front bezel. Totally looks more high tech than the bubbly front with the orange LCD on the older boxes. Also I have the format button on the front, and I can now use that EFC code on the remote to switch formats on the fly! If I'm going to watch something like House on FOX or a football game on ABC or ESPN, I can now switch it to 720p without powering off the box and loosing a recording on the second tuner.
It's a little more responsive. Not as fast as I thought it would be, but it is quicker than the DCT-6412. One thing I've noticed is that this thing handles SD so much better than the old box. Everything looks much sharper. I'm not sure if it's a better decoder chip, or the fact that it's straight HDMI instead of the DVI adapter. It's a huge difference and I'm so happy I got it! Also no more audio cables required! No more RCA "Y" Cables on my L/R outputs to feed a VCR for archiving.
First when I hooked it up however, it wasn't working right. Only the non-encrypted channels like Ch 2-27, and the odd balls that come in with my TV's QAM tuner (Like Fox News, TCM, Fox Soccer, Music Choice, Telefura, PPV Preview, etc..) worked. Everything else said "One Moment Please" which is normally the error for low signal. Had me a little nervous (It should of said Not Authorized, right???). The diagnostics all showed good levels (perhaps better than the old DVR even). 0 errors, High 36 SNR on QAM256 channels, 20 SNR on the 104.20 QPSK OOB Channel.
So the Comcast guy on the phone was sending hits, the box was acknowledging them but the channels still wouldn't come in. I persisted and he ended up sending some kind of full reset hit. Instead of the hit looking invisible it actually reset the box. Once the box loaded the time again I powered it up and all of the channels in my package are working now. Not really sure what the difference between the two hits were, but if you do swap and have issues, insist on the full reset "Strongest signal you got" hit. That fixed it for me.
My DCT-700's loaded I-Guide A25 last night, but the old DVR didn't update. Needless to say this new DVR of course has I-Guide 74.54-4003, but hopefully tonight it will get the A25 update. Most area's stage hits and do SD boxes one night, then DVR's the next night. So good timing if it comes, because then I'll get working record LED's again. That's one thing I swore I wouldn't get a DCH box until those record LED's worked.