i've got some juicy 3's and some 7's. the 3's are very good power wise. however, they do have a lot of lever throw before they bite, so the lever is near the bar. the juicy 7's have adjustment for this so it's not a problem.
for the price (74.95) for the pair they are great value!
FWIW I've never had that much trouble with the spherical washers – after initial adjustment and first use, the caliper sometimes needs re-seating, and I find I need to re-do it every month or so – they seem to twist out of alignment with time. i'd still highly reccomend them though! It's so easy to set them up.
I've had the 7's for 18 months i think and havn't had to bleed them.