I got some (fire, polarised) for a pair of Half-Xs as I couldn’t find the originals for sale at the time. They fit as well as the originals. Price was fine. Quality is fine. I’d buy again, especially for some of the weirder colours.
Royal Mail’s ‘handling fee’ on import not so fine. £8! The lenses were liable for import duties etc, which is fine, but taxes were fractional compared to the RM fee.