If you had flip few pages to read those posts then you will notice why Beyerdynamic is making good drivers, and it's so hard to loosen it, a good 300-hour is just the beginning, first 70-hour can't even consider a listening pleasure.
The IEM is bassy at 0-hour, almost spoiled the fun of "virgin" but as you burn-in that sensation will disappear. Which is why I chose XP3 over GR-02.
But if you don't like bassy IEM then like I said again previous page, this IEM might not suits you.

My XP3 is currently settled down quite a few, bass is still remain but way better than the first 70~100-hour. With the included double-flange ear-bud, the bass is much relaxed.