I've tested Hopper Medium, Light and Bold with fabricated italics with a test text copied from Wikipedia (The Dark Side Of The Moon). Prints made with a laser desktop printer.
Texts were set in 8/11 and 6/9 points but because of the extra big x-height and huge counters the 8/11 still looks... big.
Anyway I liked spacing - used not optical spacing of InDesign but the build in one - worth the long hours.
Now it is time to kern... and build features. And draw a good italic for the weights... and... :)
Hopper comes soon.