I have no experience with the Catrike, but having designed and built my own tadpole recumbent trike, I can comment on the design and recumbents in general.
1 - Like others have pointed out, visibility is a problem. Do not even think of riding that thing in a city. You will get crushed within minutes. When I ride mine, I look up at Corvette drivers. And it's not as low as the Catrike.
2 - That Catrike is a pure top speed machine with a LOT of compromises. You are very reclined, with the pedals very high in front. That makes it more aerodynamic, but it can get really painful for the neck and really hard on the cardio because the blood tends to drain from your legs when they are that high.
3 - That very reclined position causes a very big deviation for the "power" side of the chain. That causes a reduction of mechanical efficienty. Acceptable for the aero advantage in a high-speed bike, but sucky at low speed.
4 - The frame design SUCKS. It seems that they made an effort to make the frame less rigid. See mechanical efficienty above
5 - There doesn't seem to be any way to align the front tires for camber or caster...not the end of the world, but nice to have
6 - Direct steering, especially with what seems like really small tires, makes for high steering effort. Also, at high speed, that can make the bike twitchy.
7 - The weight distribution seems good, so there shouldn't be a problem with braking. That can be a problem with certain bikes.
All that to say, he should ride whatever bike as long as he can to get a good idea of what it is like on his body.
And pick of mine: built for about 300$ 8 years ago.
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Sorry for the crappy picture, that's the only one I have.