Its just the standard brompton saddle. My longest ride to date is about 18 km. Its very comfy over short distances, but I was quite happy to get to the office by then.
The brake levers - they feel pretty good, but are at an odd angle, pointing downwards. I guess its to do with the fold.
Is 18k about 12 miles? Whatever the opposite of momentum is, I think small wheels have it.
The new levers look more effective.
As for angle; from your one - possibly unrepresentative photo - I'd have said the levers are reasonably close to the correct angle (in line with your hand if your forearm and wrist were straight). However, you might find (as I did) that you can rotate the bars (or levers) a smidge without compromising the fold.
However, the bars generally give very little room for changing hand position and the bike doesn't allow for much variation in position/style, and those combined are very tiring factors.
But I am middle aged and grumpy, and there are so many more tiring factors than there used to be.
Everywhere.