Thick caps with no flex on the 1u keys. Nice texture, though not quite as textured as HHKB PBT keycaps. If there was an ISO enter, I think you'd be able to have any layout you wanted with this large variety of caps.

They're less 'brown' looking than the images suggest, which was a good thing for me.

My biggest complaint is the flash left over from the moulding is quite obvious on a lot of the caps.