I've been using RIO Powerflex for some time now, occasionally buying a spool of fluorocarbon for the last two sections of leader when finicky fish dictate. Years ago I used Maxima Chameleon and at some point started using the RIO PF. I know some now say go fluorocarbon or go fish-less, but I really question the merits of that argument. I have caught a lot of fish using Maxima and still fish with a guide who uses it. What brand of tippet do you like to use and why?