I've used Dean Markleys for 20 years or so, both electric and acoustic. Used .010 electrics until a few years ago when they started to aggravate my left wrist. Switched to .009's. (Tendon to my left ring finger was cut in half at the wrist at age 12, surgically re-attached and it gives me fits trying to play, hurts a lot sometimes. Had to re-learn to play, can't make a lot of chords most people take for granted, don't have the accuracy or strength I would like to have, don't have nearly the stretch I should have, took me 15 years to be able to use the pinkie a little. I still don't use it much. To move the ring finger I have to move the middle finger along with it, it does almost nothing by itself.)
Local music store quit selling DM Blue Steel strings, my favorite, they got a half dozen sets in that were rusted in the package. Now I'm checking out some other strings, trying to find something I like. Not many other steel strings out there, most are nickel. I'm using generic store brand .009's right now for my electrics, .011 for the lap steel, .010 for guitars set up primarily for slide in open tunings.
Right now I'm using Curt Mangam acoustic strings made by GHS on my Takamine, .011 gauge. I've been pleased with them so far, but nothing I've found lasts as long as the Dean Markleys. The Mangam strings are the ones used in the recording of "Silhouette Of A Daydream" I just posted a thread about. Check it out, let me know what you think.