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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.
Dammit-
Still seems like that kit solves different problems but I know how your reasoning goes having read years worth of comments.
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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.
Airhead
The quality of the bits makes a big difference.