I was moderately satisfied user of my RQ1050 shaver (he had trouble with my tough beard). After several years of use, I decided to change heads as recommended by Philips. Recommended are the heads RQ10 but I was lucky enough to stumble on feedback from RQ12 heads designed for shavers RQ12xx
The comments say that the RQ12 heads are compatible with RQ10 and it's all true !!!
So I bought a RQ12 instead of RQ10 and it is day and night. I have a tough beard and I finally take my razor. This RQ12 head is much more efficient and only costs a few euros more. Either a very good investment!