I have been using the whisker biscuit arrowrest for over four years. It is a very simple rest to tune, its exceptionably quiet, and its very accurate as well. I shoot carbon arrows through an aluminum biscuit. I use three straight fletched Duravanes on my arrows and I lost one FPS compared to a prong rest. How many FPS you will lose is going to depend on how fat the arrow is and how much fletching is going through the biscuit. The Carolina Archery Products website has both pictures and tips on how you can modify the biscuit to make it have very little resistance for the arrow. Essentially you flatten the biscuit by cutting the bristles with a pair of sissors or even toenail clippers. Smooth arrows are quiet on this rest. Rough arrows will be noiseier than smooth arrows unless you take the time to wetsand them so they are smooth. I have used this rest in all kinds of weather and its never let me down. Rain, snow, sleet, or high winds this rest gets it done every time without fail. I routinely shoot mud and grass covered blunt-tipped arrows through this rest when it rains and I can' t wear it out. If anything this rest is even softer and quieter than when it was new. This is a true bowhunter' s rest and I believe it does the job better than anything else out there.