I just got a set off of an open box sale (lucked out, eased the price pain). They paired with my iPhone 8 easily. Tried the supplied tips and they didn't cut it for me. Into my immense bag of tips I go (they're sort of organized). It took a few attempts to match the fit with sound quality. Once locked in, listening to The Kills 'Hard Habit to Break', I just grinned. These sound terrific. Bass is tight and deep, midrange is unfettered and musical, highs extended, no sharp spikes. Pleasantly engaging, dynamic, no EQ warranted. After a lot more listening, I might find something minor to whimper about (maybe). I've heard a ton of headphones/iem's, and I know what I like when I hear it. Me like, me like! The GT220’s are a very welcome addition to my humble collection.