Pros - Feel
Other bassists don't like playing my bass
Cons - none
Bought these after a finger injury and I found round wounds too "rough" on some sensitive finger nerves. Never like flat wound strings. Half rounds are a nice median. Still a bit slippery like flats but still punchy and bright like rounds. Restrung all my basses with these string and don;t think I'll ever switch. Also keeps other bassists away from my bass: ("These strings feel weird"). That's a pro for me!