I've tried Halfwounds in my fretted Rogue once and they didn't sounded much different from a regular nickel set like GHS's Boomer or Rotosound's Swing Bass (what means that they sounded not too bright as steel strings, but not dark as flats).
The difference may be that - as I remember - they lost their top end earlier than regular nickel strings and they clearly felt more rough under my fingers. The hard edge from sanding windings makes them as abrasive as steel strings, may be more.
Easier on fingers are the presurewound kind. Their compressed windings should makes them softer to fingers, but - to be honest - I don't remember them being much different from any roundwound. I gave up them because they didn't gave me the open sound I always look for (and the growl effect would be probably attenuated by that too) and seems to deaden too quickly.
Ah, and they will probably eat your fingerboard too (since the problem comes from pressing metal against wood). Thats the compromise effect, not too soft as flats and not articulated as rounds. To me they were somehow disappointing, today I tend to go pick a way and go for it, deep. If you want the softness and get rid off finger noises, go for the flats, don't get stuck in the middle of the way.