I have a bunch of the 4e tiles (not that they're system-specific or anything) as well as some Paizo map tiles, and I really haven't used them much. As [MENTION=54629]pukunui[/MENTION] said, you really have to tailor the encounter to the tiles - it's usually not very easy to use the tiles to match dungeon maps from published adventures. For one thing, they're usually too small for most areas, and they're hard to do irregular shapes with. I was trying to figure out which ones to use for the Scarlet Stone Monastery in Princes of the Apocalypse, and after a while I just gave up. I wouldn't even consider using them for the actual elemental temples.
I have gotten some use out of the decorations and "effects" that came with some of the tile packages, so the investment wasn't all wasted though.