These little beauties arrived today - claimed for free after getting the S20 Ultra.
I'd read the reviews beforehand and agree that it's best if you set the audio to Dynamic in the Galaxy Wearables app as they sound a bit flat on default settings.
Are they worth £150? Probably not if you just think of them as earbuds but you're also paying (if you actually buy them) for the tighter integration with other Samsung devices.
I'm happy with how they sound and fit, I've not had to change from the default buds and "wings" attached, but will need to see how they perform under more "normal" circumstances.