No, not unsafe - just don't feel as effective - mediocre is a good description. After first few stops they're fine. IE take it easy first thing in the morning. These will be impossible to get fade on the road.
I haven't had any other pads of the same ilk to compare (only some Pagid hi po street pads that faded on track after 2 laps). Once you find something that fits the bill (a pretty big bill), you tend to stick with it.
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