I found the cartridges to be OK: owned two at different times, nothing later than 2003 when I ditched vinyl, they've probably changed since.
The on-ear headphones at least are a pain for me to wear. I seem to remember that they were not so bad sounding years ago, but recently they seem too bright, as others have said. I've only had contact with the Prestige series lately though.
Their website is slow and pretty awful as well, unless you like watching a GIF of a G logo appearing and disappearing for over a minute, followed by constant redraws of the page you're trying to read when it appears.