Got the Soundprotex Plus a couple of days ago cos of Amazon UK discount. Soundwise the high attenuation filter on the senns are similar to what I remember of the ER20XS when I first got it 6 years. Maybe a bit of a upper mid peak to my ears (edit: seems to be reduced once I got a better fitting size), with an overall mid emphasis.
Comfort-wise the senns are much better cos they are less stiff, and the different sizes probably help too. But the softness does make it more difficult to get the fit right since it squishes around more. The pull tab is also soft silicone and can be difficult to feel for once the earplugs are properly inserted.
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