I installed a set of ProSteels (50-105) on the `bird today. So, the steel string experiment has started ahead of schedule. Initial impressions after stretching them - the sound is good. A bit brighter than NYXLs but not a huge difference. The feel is different. Not rough, but not slick like NYXLs. It is a feel I think I will get used to. After installing and playing, it felt like there was some kind of residue on my fingers - perhaps just surface oxidation? I'll see how long they last; for me, NYXLs lasted much longer than nickel XLs.