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I did a lot of research on violin strings before settling on these. I was looking for strings that would give my instrument a darker tone. In this respect, they partially did the job. The sound was definitely a little less bright. However, in addition to toning down the brightness, they resulted in a less dimensional sound. It was a little tinny.
Naturally what works for one instrument won't necessarily fit another, so the tone quality should be taken with a grain of salt. Manufacturing quality and flaws, however, do not discriminate based on instrument selection. The A string has an infinitesimal flaw right around where you plant your finger for D. Though it is small, it makes shifting into other positions more difficult. My finger catches the flaw in the winding, each time I shift, resulting in drag. This means I can no longer land shifts on A in-tune. Consistency is gone. So now I get to order a new A string.
Other reviews are pretty accurate when they say there seems to be a problem with quality control. I won't be buying these again. Two stars is generous.
These used to be my go-to strings. A great synthetic core that is similar to gut, for a lot less money. However, I found in 2013-2014 that D'Addario had some serious quality control problems. I had several broken strings, and a set that came with flaws (ends unwinding). The D'Addario customer service was excellent, but I'm just afraid to buy these anymore. I've used these strings on my cello and another that I loan out to a student -- I've checked both cellos for sharp points. Also, the strings broke in different places, so I don't think the issues were with the cellos, themselves.