Being new to the mandolin, I can only compare these strings with the ones that came with my instruments and the ones on friends mandolins. They compare well with both of those. They are bright and clean sounding and hold their tuning really well. For a value string at this price, that is pretty impressive.
I play an f-hole semiacoustic mandolin, playing a variety of bluegrass/folk/punk sort of stuff and so these strings don't have the easiest of times. I also bought several sets in one go, in case of breakages, but after replacing the original strings on my instrument, I am still on my first set of these strings.
I had thought that I may eventually change to a more expensive string, but at the moment, I don't see why. These strings are doing the job.