I can tell you some good stories of their service here in Austin... I was one of the first in the service area to get digital service... they came and hooked it up and all I got was analog sound -- no dolby digital for ANY channels... So I talk to tech service and they want me to take the issue up with KENWOOD (makers of my dolby digital A/V receiver)!!!.... After going through three layers of customer service, and swapping out two units, I finally talked to engineering's department head -- he had no clue why it wasn't working... he got back to me three day's later to let me know that HIS engineers hadn't informed him, the marketing team, or customer service, that they hadn't gotten around to activating the digital audio yet -- and wouldn't for 4-6 weeks! All this while they are bombarding the market with adverts for "CD QUALITY SOUND"!!
Then, they didn't know it was DD 2.0 and not 5.1, and they didn't know that it was only provided for the digital channels...
I find that ALL my channels are stereo when I use the composite audio outputs, and if I run them through a dolby prologic receiver, I get 3- or 4- channels of surround sound (depending on how the source program was originally recorded)... I have never tried using the RF connection -- so I don't know whether or not it is stereo or mono. I do know that most VCRs and some cable boxes have a MONO output through the RF (check http://www.avsforum.com/ubb/Forum13/HTML/001844.html
for more details). I will hook up the RF to the TV and see what I can tell...
I'll give the simpler non-A/V Receiver description of the hookup I use to get everything in stereo (run it through an A/V receiver and you get surround sound too)
A hookup that works good for me -- and gives me a good picture/sound in all cases, is to split the RF feed at the wall, sending it into the ReplayTV unit and the Explorer 2000. The Explorer 2000 has three video and three audio outputs (s-video, composite audio/video, RF audio/video, dolby digital audio)... I send the s-video to the ReplayTV Line 2, and the composite video to Line 2 on the TV. The composite audio I split using "Y" audio cables, sending it from the Explorer 2000 box to Replay Line 2 and Line 2 on the TV. The s-video from ReplayTV goes to Line 1 on the TV, along with the composite audio. With a strong signal I split the RF feed at the wall 3 ways and run it into the TV's RF connection.
When I set up the Replay, I use "digital cable" for line 2; "cable ready tv" for the RF feed. In the channel guide I delete all the channels under 1000 (box channels) which are duplicated above 1000 (RF analog cable channels).
So I can...
a)Watch Analog cable on the TV at any time (TV's Cable Ready Tuner)
b)Record analog cable on the Replay at any time
c)Watch the cable box while recording on the Replay from an analog station (or watch the same digital channel I am recording without losing resolution due to MPEG encoding)(TV line 2)
d)Watch a recorded show or live feed on the Replay (TV line 1)
Inserting an A/V receiver between the units and the TV is not difficult and you get surround sound... You can add more components then (VCR, DVD, CD/TAPE, etc); you can also send the dolby digital 2.0 to the same line input on your dolby digital ready A/V receiver as the composite audio/video cable box connections -- then you can utilize the "CD Quality Sound" -- note I can't tell the difference between surround-decoded composite analog audio and surround-decoded dolby digital 2.0 audio.
hope this helps