For anyone who's curious, Reach TotalCare Floss is the best:
* Very shred-resistant
* Grippy, even when wet, so you don't have to turn your fingertips purple
* Thin enough to fit most teeth, but supposed to have some sort of textured surface to work better
I find that regular old Reach waxed works just as well, and has two benefits over Totalcare: it's more comfortable and it's cheaper — dirt cheap for floss, really.
For me at least, traditional floss shreds and breaks. The finger-tips aspect is a deal breaker for me. Floss is such a minor expense at the end of the day, it doesn't make sense to worry about the price -- that said, the non-slippery-when-wet aspect means you can use less of Totalcare, evening out the price differential somewhat.