They work just fine, in fact they are arguably superior to tantalum in terms of performance and reliability. Only reason I've mostly used tantalum is that they are roughly half the cost of the ceramics. Either one is vastly superior to the original parts.

The original SMT electrolytics are *terrible* capacitors by nearly any measure. I'm not entirely sure why they're as lousy as they are, but the specs are junk across the board. If it uses a SMT electrolytic, the specs are not critical and anything with the same ratings will work fine.