At the time of writing this review, I haven't received my order from Thomann, but my review comes from my previous purchases from other vendors. I have plenty of experience with these strings (they're my favourite)
If you want old school thumpiness, with plenty of attack and percussiveness, and especially that woodiness that good, smooth flatwounds are known for, these strings will certainly do the trick.
Although many flatwounds require a fairly lengthy break-in period to sound right (and for the strings to have similar tonality between them) the GHS take less time than a lot of other brands. They are especially smooth to the touch and despite having a fairly tight wrap, they remain flexible enough for string-through bridges.
Frankly, I find these strings to be underrated. Labella might get all the accolades and the reputation, but these strings, which are very much in the same sonic territory (as compared to D'Addario's, Ernie Ball Cobalt Flats, Rotosound Monel 77s, etc...) and they are often a lot more affordable.
Give them a try. Keep them on the bass for a while, let them break in. They just might be what you're looking for.