Well I haven't heard those, but
this guy has been listening to his for longer than I've been listening to my AT-15s (30 years). That's got to tell you something.
Cerwin Vega makes very good speakers. While they aren't for everyone, there are plenty of people that like them. The R-26s are from the 70's and from my understanding won't be as bright as their later stuff, but should still be very good for a wide range of music. I listen to a bit of almost everything and have never been disappointed.
One thing all CVs seem to have in common is that you don't need big power to get good sound at decent levels but the more you can feed them the more they sing.
One of the things I like about the CVs I have is they are very good at making every instrument sound distinct.
Of course, like any speaker, if you take your source to distortion they'll sound like crap. Since many people's only experience with CVs were college parties with cheap stereos cranked well beyond reasonable levels their first impressions were less than stellar.
https://www.hifiengine.com/manual_library/cerwin-vega/26.shtml