Have you done it?
How frequently?
Who did you use? Experiences?

Some net searching hasn't revealed any recent threads on the subject. I know about:
Fish
Mountain Tools
Yates - doesn't do cams older than 10 years and no tri cams
BD - only does their own brand
Mountain Gear - no longer

I had Yates resling a bunch of my cams a few years back. Some were > 10 years old. I was very happy with the work - they had a whole slew of options (though no dyneema yet then).

Just had my set of Camalots reslung by BD for the first time. All but one are older generation single stem cams that are anywhere from 4-8 years old. I have one newer C4 and had it reslung, too, just so they all have the same anniversary. $5 per, plus $5 for postage, which seems very reasonable. Quick turn-around (less than 3 weeks.) The replacement nylon webbing on the cams appears identical to the original material and colors, something I haven't always seen from other companies.

I sent my full set of Metolius cams (TCUs, FCUs) off for reslinging by the manufacturer. The results were spectacular -- in addition to reslinging them, Metolius totally reconditioned the cams (cleaned, polished, lubed). It was like getting back brand-new cams. They look so pretty I haven't had the heart to lead with them and get them dirty, heh heh.

The price was hard to beat too -- $3 each. Don't know if they do this on other manufacturers' cams.

JL

Same experience here with Metolius. They polish the cam lobes so they look like chrome! I can only imagine what they'd do to the engine on a vintage hot rod.

I haven't gotten any redone, but use BW Titan cord. Two loops so it can be extended like other dual-loop webbing. I cut off about 2" of the old webbing and pass the cord through so it retains the color coding. Works with older cams have a solid stem, not a loop like the new C4. I've read you shouldn't do it with cams with loops because the cord is too thin and doesn't distribute the force across a larger section, not sure if that makes a difference or not.

I had a bunch done by Mountain Tools some years ago. Nothing fancy like Metolius apparently provides, but very satisfactory work.

I've had Camalots reslung by BD. They did good work, but it did take a couple of months.

JDW

I've had Metolius resling my TCU's... they did a great job, and quick.

I've had BD resling many cams and they've done a great job (and I do it during a stormy season (late Nov-early Dec) and it will probably only take 2-3wks from the time I send them to the time I got them back. They also fixed a couple trigger wires that were frayed replaced free of charge (and I din't even ask them to do it) but I won't say they'd do that in the future again.