I'm a little surprised to hear this from you. We considered an Argos years ago, but decided they weren't the right machine for around here. The ones I've sat in are a tight squeeze for anyone with an inseam longer than 18", and I'd have little patience for banging my knees against the front of the tub for hours and hours . . . for you it would be worse, a lot worse. I'd be interested in having a look at Argo's Centurion, but not unless they have more leg room.
If you think I'm too big for an Argo you should have seen the guy that owned it. As tall as me and North of 300 lbs. They're no Cadillac, for damn sure, but the benefits of the platform outweigh the limitations.
I don't remember Charlie being taller than me, but he is a big lad.
if i can squeeze in you both can ....