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Dammit in reply to @Airhead

The quality of the bits makes a big difference.

I've tried very cheap, and very expensive - all have failed to make any impression on our walls with a standard hammer drill.

The SDS bits are, IIRC, very cheap - but that hasn't mattered due to the drill behind them.

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Airhead in reply to @Dammit

Don't buy cheap SDS drill bits, they disintegrate at the cutting end when you use a powerful SDS drill. I have had some just bend rather than drill into the material.

The toughest walls I've ever come across are in the Barbican, they used some special render.

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