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Well done stained or dyed concrete floors are fantastic. Much easier to clean than tile and when done well they look great. The best looking concrete floors are the ones that were initially poured to be a stained (or dyed) floor. I think the dyed ones turn out better, with the dye mixed into the wet concrete prior to pouring. But stain can work well if you know what you are doing. Practice the technique somewhere where it won't show, until you can reproduce the effect you want. Closet floors and storage rooms are good for that. Be forewarned: if you have cracks or tack holes in the existing floors they will show up - a lot - no matter how well you think you've patched them. The patches seem to take up the stain at a different rate from the original floor.
I've seen a lot of dyed, stamped concrete floors that are supposed to look like flagstone and just... don't. Fake flagstone can be really tacky looking. Stick with flat floors and don't try to make it look like something it isn't and you should be fine. If you don't like the results you can always go back later and pour a thin, dyed layer of concrete over it. Or tile it.
Disclaimer: I've used dye in wet concrete for a patio area but have never tried to refinish an existing slab with stain or dye. I do see a lot of houses as part of my work.
Good luck with the floor project! We will have to have another BYC potluck at your place when it is done, hint... hint...
Thanks! I think another BYC potluck is a great idea.