Speed is Over rated. fobs are Fantastic. They have a tad more drag. But you end up with better Accuracy specially with those long shots. I've never lost a Fob while out Spot and stalking for several years. I do take care of my equipment and I'm always aware of my bow and Quiver location and placement. I don't recommend that you group shoot with fobs. I shot one Arrow per spot or Vital Area. Fobs can last a long time as long as you don't do heavy grouping. when it comes to fobs hitting branches, its never happened to me. whether I'm using vanes or Fobs, i don't shoot Unless I know its 100 percent Clear of any limbs. So I've never popped a fob off on a limb or through brush. Check out
www.starrflight.com for more info including whether you need regular or Axis Fobs.
www.southshorearcherysupply.com sells full tubes, half tubes and 3 pack for sale.