I like the way it's turned, but it needs a subtle humanistic touch to make it less stark, and more curves should merge rather than collide.

To my point of view, I find this encouraging, I like the lower case, the rounded version is nice, however I agree with you, the g has to be reworked. I think the join between the two bowls is not well done and the lower bowl should be bigger than the one on the top. Also, I think there could be a problem if you use on all caps the the oblique line, particularly in the capital letter B H E F and also in the lc f. May be keep it only in the A. This characteristics can make the reading difficult.

I've embedded the thin and bold test sketches below, to save clicking through.

I considered dropping the angled crossbar on the lowercase 't' and 'f' as I thought it would cause problems. I'm reluctant to lose the angled crossbars on the uppercase though, as it's one of the main features carried through from Magnitude, but I can understand why it might become a problem and I might need to rethink these too. Maybe I can keep them for an alternate display version or something.

I'll try to get a vector sample uploaded asap to get some other suggestions. The sketches look a bit harsh, full of errors and inconsistencies.

Thanks for the feedback so far!

So I think the main questions are... should I try to keep the 'angled horizontals' where possible? And which ones do you think will cause the most problems and should be dropped/reworked? (as sim said, the B, E, H, F and f might be problematic).

Try curving them so that they have the angle on the left end but horizontal on the right.

I'm not happy with the double-storey 'a' and 'g' - in fact I'm considering dropping them altogether as I don't think they fit well with the rest of the face. There is also an alternate 't' and 'f'. I'm drawing the uppercase now and should have the file to upload shortly.

Ok, here's the first attempt at the caps for the thin weight. PDF linked above (lowercase included) and JPEG below. Anyone got any comments suggestions? Thanks in advance :)

I like the crossbars of the latter of each set, but I'm not sure about the new a and g. For the a, maybe you could try shortening the second a and extending the downstroke up into a second story.

If you haven't already, check the wikipedia articles for all the letters' histories.

I love it. :)

Not really a very usefull comment, but I can't give any better critique without better samples (text settings).