Watched tutorials on rebuilding calipers on youtube. Looks pretty straight-ahead if you are careful and keep everything well-greased. I'm considering doing this because my RR caliper is hanging up badly, and a $6 rebuild kit with seal and dust boot is a little more appealing than $70 for a reman ($ very tight). Obviously it would make sense to redo both rear calipers and two man bleed all 4 corners. So my question is, if you've done it, is it worth doing a rebuild vs just putting a new caliper in?