I've decided to re-write my review (and increase my rating), because some of my earlier criticisms were perhaps unjustified.
I'd pointed out excessive fret noise/ buzzing, however it turned out there was an issue with the bass I put them on! Once this was rectified, fret noise was minimal.
I also felt that they were a bit rough on the fingers. However, having played D'Addarios almost exclusively for over 35 years, I admit I was foolish to expect otherwise!
As an experiment, I decided to compare them with the cheapest strings on eBay & Amazon, and I can say without hesitation that the Harley Bentons are far superior.
After playing these strings for some time (and having the bass fixed!), my fingers are now accustomed to the different feel & they're actually not bad at all. I'll definitely be buying more.