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@danstuff is correct, the Hope shim wouldn't work with Shimano BB's and the shim is in two parts so you'd have to remove the NDS cup to install/remove the shims, also removing the shims from the bearing is a PITA.
Not sure how the Hope BB compares to a DA or other Shimano for durability but for me it's well worth paying the premium for over a Sram GXP. I trashed a GXP BB in 2 months, have been happily riding the Hope for 18 months with no sign of grittiness yet.
Would Hope conversion shims fit an SM-BBR60 to allow a GXP axle to fit a Shimano BB? Would be handy if they did a: to help @Scrabble (the BB is skinny and cheap) b: to allow me to drop some temporary Omnomnoms into my T3 which currently has that BB occupied by 5700 cranks.