Travis Tzioumis wrote a review of RIO Fluoroflex Plus Tippet on August 20, 2014
This is strong tippet, it also does not have fiber optic properties like monofilament tippet does, so it will not carry light down through the water on a nymph rig on those bright sunny days. It works great with hopper/dropper rigs as well. Although it does not float as well as mono big foam hoppers will still float well on the surface. Using it on a hopper allows the fluoro to drop down into the water column and out of the surface tension, which creates much less light refraction. Its abrasion resistance lets your nymphs and streamers get tossed or stripped against the rocks/sand/plant life without compromising the integrity of your tippet. I still use mono for small dries ties with natural materials that don't float as well on their own.