bad caliper?

[kevinkay]

had the right real caliper sticking, heating up - TONS of brake dust.
replaced it with a rebuilt $62 caliper found at a local independent truck parts store (they ordered it and got it next day). Fit, looked like a new piston, only discrepancy was the bleed screw was 1 mm smaller wrench size than the rest.
Next week, ordered rebuild kits for remaining 3 rotors $25 a wheel - rebuilt and heavy flushed and bled system.

fast forward 1 year:
driving slow speed in a parking lot noticed awful "grinding" noise with rotation of wheels. (fist panic is bad bearing and I HATE doing bearings).
Stopped, checked it out - again right rear caliper is HOT, smells and rotor looks too shinny. Let car cool for 2 hours, drive home about 1 mile, no noise, that wheel hotter than the rest, but not overheated.

I ordered a new rotor FCP $300 it should come tomorrow.

Anyone have bad experience with rebuilt calipers? I have read that once a caliper heats ups/cooks that it should not be rebuilt?? (and assuming the one i bought had been cooked)
Should I fear an issue with master cylinder this being the wheel furthest and not getting enough pull back pressure?

OR - you get what you pay for - $62 for the rebuilt caliper?? when the rebuild kit costs $25 re-using the old piston.....

THANKS