My Jamis Renegade has Shimano BR-RS505 hydraulic brakes that work well and offer good service life with resin pads in nearly all conditions. The big exception was one ride on the C&O Canal towpath in moderate to heavy rain where dirt and mud seemed to build up into a paste that just ground away at the pads. 50 miles in those conditions just obliterated a set of week-old pads. I think there's more to the story though as I was getting some pad rub on the rotors in the weeks prior and adjusted my caliper alignment to compensate. I'm pretty sure I incorrectly diagnosed the cause of my brake rub and that probably contributed to the very poor brake pad life. When I did a post mortem of that nasty 50 mile ride I discovered that my pistons had gotten a little gunked up and were binding, resulting in uneven, inconsistent brake application. I carefully advanced the pistons and gave them a thorough cleaning and realigned the calipers.

Fast forward to Saturday when I just completed a solid 150 mile stint on dry gravel, damp gravel, damp dirt, plus mud puddles on the C&O. There was a decent amount of descending too. I checked my resin pads before and after the ride and there was very little wear. So my opinion is that resin pads work well in most conditions when the calipers are properly serviced and symptoms aren't misdiagnosed by idiot Jamis Renegade owners. That said, I now have a set of metallic pads and a second set of rotors on hand for any dirt/gravel/mud conditions that might be considered extreme. I haven't had to install them yet so I can't comment on how they feel compared to resin.