I found these strings to have a great mellow tone, especially in the lower two strings. Normally my violin would sound bright but quiet, so this was a welcome quality.
The G,D, and A strings are durable.
The only downside is that the E string tends to discolour easily and therefore its tone did not last as long either. Other colleagues had complained of this also.
In terms of playability, the responsiveness is great. They were also easy to break in.