Notnek
Took my stage 1 yesterday also and pretty much agree with all that.
ATC paper: Found this quite easy but I did absolutely hammer the revision for a good week before the test. Easy if you learn everythink in the PDF simple as that.
Numeracy: Found this alot harder and actually thought I'd failed, but just finished it. As it turned out I never failed despite throughly believing I had.
Cubes: Thought this was quite difficult. The questions ranged from really easy to extremely difficult. Likewise if i've failed I would say it was because of this. Finished most of it but not all of it (does anybody?).
Diagramming: Not too difficult, although they do get quite tricky towards the end.
Just waiting on an e-mail now, fingers crossed. No idea whether im through to stage 2 or not.