who to trust for hydraulic flat lifters these days?

"Cam Savers"? Never heard of those. were they like Rhoads where they bled down more, to tame a too hot cam or did they somehow make up for a lobe that was going flat? (don't see how that could happen, a lifter aint gonna put metal back onto a lobe) or solve some other cam issue?
Anybody use those Lunati ones I asked about? I see those on Amazon cheaper than I did on feeebay, with free shipping even. and specs say they're supposed to be made in USA.
theres always the old Melling or sealed power etc "old standbys" I am pretty sure I don't want anything from Comp these days.
How much does it cost to have a set of old ones refaced? I remember that Oregon does that, it would be nice if someone quasi local does/