Funny... my friend and I were discussing this drive train option for a possible custom build.

If I ever get my own trike I will hand build my own to make sure every detail is right... my friend has had his Catrike for 3-4 years and his only complaint has been that the front fender mounts were rather poor and have needed replacement and both agreed and IGH with a Schlumf or other internally geared crank would be ideal to keep things cleaner and still offer the needed range as it has to be pretty wide to handle the flat speeds you can reach and low enough to climb with a load of touring gear.

For a touring trike this machine is still faster than most two wheeled uprights and the performance is wonderful.. it weighs 32 pounds dry (IIRC) and does give up a little on hills but is not bad... I figure my legs are not quite up to speed as it does utilize different muscles and over time the hill climbing would probably improve.