I bought these to replace the factory Chromes on my new Ibanez AF255, which are said to be .09-.42. What an improvement in tone! These strings are mellow with a great bottom end. There is a lot more "complexity" to the midrange and the overall tone. They are sounding better the more I play, too. I think I have found my new go to flat wounds.
They are not a bad price in the world of strings these days and I don't mind paying a few extra dollars for a superior string. Plus they throw in an extra B and E string in case they break. Highly Recommended!
Now, on to my impressions: I've tried four different brands of flat wound strings on my Archtop, and these are my current favorite. I did try the La Bella 20PCM (12s) set, but found them just a little too stiff feeling.
These strings have a nice attack, yet are mellower than round wounds. They are also very smooth feeling, which is what you want in flatwounds anyway.
These strings cost a bit more than I think a set of strings should cost, but they are not the most expensive flatwounds either. Also, I've had the current set on for a couple of months, playing about 2 hours per day, and they still sound fine.
If you are switching from a set of round-wound 12s, this might be a nice set for trying flat wounds. Although I could not find tension information on these strings, it is my understanding that flat wounds tend to be higher tension than their corresponding round wound counterparts. I definitely find that flat wound 12s feel stiffer than round wound 12s. I do sometimes change from round to flat and back again.
Finally, I should say that I had a leftover set of 12 and 16 1st and 2nd strings leftover from a 20PCM set, which I used to replace the 11 and and 15s on this set, and I really like this combination. It would be nice if I could buy individual LaBella strings so that I could make up this custom set.
All in all, definitely worth a try if you are checking out flatwounds!