I build and sell a few feather rests (FR) and I'll give my honest assessment of them.
On the positive side:
-They are surprisingly durable if made with wild turkey feathers. When I first started making them I used artificial barred feathers and they were "junk" IMO. No big secret here. Those of you that fletch arrows with natural barred feathers will attest to their superiority. Look at how many bows are being turned up from the 50s and 60s that still have original feather rests in place. I assume many of those bows were shot a great deal.
-Feather rests are easy on arrow fletching. I hate having my 4 oclock feather all frayed up from other arrow rest materials. With FR this hasnt been a problem. A small investment in a feather rest may keep your $100.00+/dozen custom arrows looking great longer.
-They look "right" on certain vintage bows. This of course has nothing to do with function but it's important to some.
-They are pretty forgiving. I find that arrows fly pretty good off of them and they are less critical of nock placement than a rest material that is more rigid such as leather or a rug rest.
On the negative side:
-When they are soaked with water they are about as worthless as soaked arrow fletching. It's possible to cover arrow fletching and keep them somewhat dry, but in a downpour a FR is gonna be wet and you'll lose the benefits of shooting off of a FR and be shooting off of a piece of leather. I also find bloodtrails rather hard to follow in a downpour so this hasnt been a real issue with me. Drizzly damp weather is fine, downpours not so good. The rain doesnt hurt the rest and it will dry out and be fine just like arrow fletching.
-The feather rest elevates your arrow at least a 1/4" above the shelf . Today's traditional archer typically likes the arrow shelf down close to his hand.
I suppose there's pro and cons with all shelf materials. I like feather rests on my bows that originally had feather rests but I don't have them on my bows that came with something else.
Trap