Yes, those J&H handles are a bit pricey but very nice. If you're setting up a double trapeze order one pair of each color. The likelihood of you and your crews' trapeze "height" being the same will be rare. You'll want to designate one color as "skipper's" and the other as "crew's". Nothing more annoying than hooking up, sliding out and being too low or too high on the wire.
A lot of folks like to double up on the rope locks (an insurance policy) as heavier crew can cause their premature failure.
Another nicety, is the removable sheave, block to put on the end of the trapeze wire. Allows the rope to move freely, or smoother than through the thimble.