I won't be buying in new with felts since they simply aren't being made much anymore.
Funny thing is that felt soles are seeing a "re-birth" after the initial push for all-Vibram/Aquastealth/proprietary sticky rubber. Simms, Patagonia, Chota, etc are all offering them.
I switched to Vibram a couple years ago; with studs, they do a pretty good job (although there's a couple spots on the Big Hole where nothing seems to keep me upright), and if there's any snow around they win, hands down. If I had done a little research I could have saved myself some $$ and bought motorcycle ice-road studs instead of Simms.