I use 'em. I'm also the guy who made the pair DHWILKIN is going to review in a couple weeks -- so if they sound like ass, you'll all know who's fault it is.
Before DIY I used Monster's consumer-grade stuff, like you can get at Circuit City for $50. DIY beats it with a stick. I've never shelled out for any of the good commercial stuff, so I can't compare it. I think Wing has done the Pepsi Challenge with some Belden DIY vs. commercial products, though.
Summary of my experience: Belden 1505A, great for video and digital audio, so-so for analog audio. Terminate with Canare RCAP C4F.
Belden 1506A, great for video, pretty darn good for analog audio. Terminate with Canare RCAP C4F.
Canare Star Quad mic cable. Pretty darn good for analog audio. Terminate with Dayton Audio RCA's (available in locking or nonlocking) or Canare F-10. Or, get www.markertec.com
to do it for you, pretty cheaply, too. Also good for replacing poor cabling in amps and CD players.
Belden 89272, really great for analog audio, but I'm not sure Belden still makes the same formulation I've been using. Terminate with Dayton Audio RCA's (available in locking or nonlocking) or Canare F-10.
Belden 89259, really great for analog audio, but hard to find anything less than a 100-foot roll, which costs over $100. Terminate with Dayton Audio RCA's (available in locking or nonlocking) or Canare F-10.
CAT5 braided speaker cables, great stuff, if you be sure to use the teflon-insulated Belden brands Chris and John recommend. Scrounge EBAY for a while and you'll be able to score some for cheap. Use the Rat Shack gold crimp-on spades to terminate it.
Aside from the Cables forum at audioasylum.com, this is the other seminal DIY cable link: http://members.nbci.com/Jon_Risch/