I upgraded from Canterbury SE to GR, and the latter definitely has more treble energy & extension, which I felt was a bit lacking in the SE (with controls set to "flat") - it’s more balanced, more detailed, and simply a better speaker. I enjoy them more. I didn’t change my speaker positioning or toe-in, and still use the tilting trick, for which I found that HRS Nimbus spacers (mix of 0.8" and 1.3" spacers) look great with the stock feet! I wouldn’t advise mixing the GR with any bright gear, but that’s fine.
I’m somewhat interested in the new super tweeters, but don’t feel like anything is lacking here. I tried the old ST100B/ST200 and felt that they’re just not good enough for the improved GR models.
I really liked my old Kensington SE, so I bet your GR are the bomb, @jahatl513!