My son bought me a Rio Windcutter for Fathers day so I'm anxious to try it out. I like the loop to loop connections and have used the Rio Braided Loops, they are made for the larger Spey lines.
I actually have a number of leader combos depending on how and where I'm fishing.like Toolman I use a tapered leader, about 6 feet of the butt end. I then add 2 - 3 feet of leader material depending if I'm nymphing with droppers or setting up a Czech Nymphing rig. I've been using a furled leader for dries and a straight 3 ft 8 lb for streamers. I'm still experimenting with different rigs.