The silicon fluid will absorb less moisture, but it also compresses more than a conventional fluid, which can make the pedal feel "spongy", no matter how much you bleed the brakes. If this is a driven car, I would suggest staying away from the silicon brake fluids...just my 2c.
Replacing the calipers is pretty much a take off/put back on deal. Be sure to "bench bleed" the master before installing it, to get all of the air out of it. There may be instructions on how to do this with the master cyl. If not, there are a couple of threads/posts here on that.
Start bleeding from the RR, then LR, then RF, then LF. Be sure to bleed both sides of the rear calipers, starting with the
inner bleeder, then outer.
hth
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