The thing that I don't really like on this cage is the fact that there isn't any "lateral" triangulation. Also the angled A to B bar looks like it would make it a pain to get in and out of.
An example of what I mean is the X Brace and the angled tubes (connecting the rear hoop to the rear of the cage) that Olmann has on his cage.
I'm digging Oltmann's. Very well thought out. No tubes near the drivers/passengers head to rack their melon on in a rollover.