Interesting.
I didn't know it was an option on the 3.7.
Whilst the Roadster is a lump to steer around roundabouts etc, I would worry that the power steering would remove the rather visceral nature of a Morgan. In addition, power steering is extremely difficult to get right - if set up wrongly, it can remove all the good stuff.
I'd love to try it to compare, but doubt I'd have it.
Is there a retro fit I wonder?
ETA David, yes it is noticeably heavier to steer than a 4/4 and +4