4 sets of Hope's here, 04's and 07's, mostly M4's 180mm. Power aplenty with good modulation but I can only compare them to the Magura discs I used to run. Have been eyeing up Formula's as they are very well regarded, but for servicing and common parts I've stuck with Hope til now.
07s have the silver CNC finish, nice, and the postmount calipers are a doddle to adjust drag-free. But I love the clean look of the size specific IS stuff on the 04 versions. Hope PM-IS adaptors are nicely machined pieces, but it still looks bulky. The new 09 stuff looks good too, not seen one in the flesh yet.