So, finally soldered them in.
Took 3 weeks to get them and it was a bit of a pain to solder. The guitar has a Schaller M 5-way switch. It has no holes, just contact surfaces, 24 of them. So it's very tight and the Luthier did a very clean wiring job with all cables being extremely short. I have a rather complicated switching with plenty of small connections between the different contacts, so it was difficult.
Anyway, now they're in and the first impression is that they're great! I was afraid the neck would be too bassy and muddy but it's not. It has plenty of bass but it's tight and the notes come out very clear and defined. Much better than the Paf Pro that was there before. It was really muddy when playing faster runs on the wound strings. So far so good! I guess the fact I use a 1 Mb volume pot and no tone helps keeping the bass in place?
I'll give them a couple of weeks and then try to do a small review, maybe I'll make a video aswell...