The ProSteels series are brightest sounding of D'addario's electric guitar strings. Coupled with a heavier gauge set (12s or 13s tend to boost the lows), they can produce a metallic, piano-like, tone akin to that of Elixer nanowebs and at a fraction of the price. I've found that ProSteels (stainless steel) tend to retain their brightness for longer than the XL series (nickel plated steel), however; once the tone begins to dull, the strings really lose their charm. Definitely worth a shot if you love a metallic and bright sound but aren't a fan of coated strings.

I'm not pro, but strings sound well, do not get out of tune easily.

For years I have used D'Addario XL's (9-42)which sound great and never break but holding tune is so so. I thought I would give the pro steels a shot and have been very pleased with the results. I am using them on a us tele and strat at the moment and both sound great and the tuning is rock solid.