abuttino:I don't know if you heard but these are two tuners built into one device. If you get more than one of these you prolly will have to get a RAID array to deal with the bandwidth. Especially when you are recording 4 HD shows at a time.
I don't think so.. I have 2 HDHomeRuns and frequently record 4 shows at a time (while watching an already recorded show). This is from a single 500GB SATA drive and don't have any issues.
I've also had a few times that I've been recording 4 HD shows as well as 2 SD shows from my PVR-500.
I think I've heard that DirecTV will use MPEG4 which is better compression than the current HD from the HDHomeRun which is MPEG2 so the overhead should be less.
Vista Ultimate with TV Pack
Core 2 Duo E4500 @ 2.2GHz (OC'd to 2.9) / 4 Gigs Ram
c: 80 Gig d: 500 Gig SATA
Tuners: PVR-500 / HDHomeRun x 2 / WinTV 1600
Extenders: DMA-2200 / DMA-2100 x 2
Linksys V1 extender (for sale..anyone interested?)