Damn good. If it wears out your guides then your fishing too much.
Hard chrome guides will last years.
I think the urban myth was perpetuated by XXX Fly Line Company and others.
If SS has "scales" then only a little bit is touching the guides.
Put on your old trusty Cortland Peach and drag it through the guides and tell yourself how much of THAT line is touching the guides.
The stuff floats like no other, you false cast less because it shoots farther.
And so your fly is on the water more.
I've got some that's now two years old and it's like it came out of the box. SA says it's self cleaning, but I still clean it. 5 years from now, I'll probably have the same line and ask me at that time.
As for stripping streamers all day, I don't care if what you fish with, your skin is constantly wet, any line you use will put the hurt on your digits. Being a service technician for a large construction rental company for the last 31 years, my hands aren't model hands like George Costanza's. So I don't notice it.