I haven't found squeaking to be a problem at all. They do a bit when they are wet or when driving in a parking garage out of the cold.
They work fantastic in the cold in my experience - I've tested them down to -30 C. However, watch out coming out of a touchless car wash, especially in the winter. You practically have to stand on them to get them to work at first. Getting up to speed and a long stop brings them back
The 641's are a tight fit over the calipers. This isn't a problem, but the lack of choices and reluctance to change them yourself with a floor jack is definitely a drawback.
Apart from that, they look great, don't generate brake dust and feel really great to use even in daily driving.
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