I tested both Rxton 7 (37deg) and Rxton 9 (39deg), with 1 layer of national yellow on the Rxton 7 and 2 layers of national yellow on the Rxton 9 on a DHS W968 replica. The Rxton 7 is very nice imo, very controlled but not slow at all. The Rxton 9 on the other hand had a similar base speed than a D09C imo. The throw angle of the Rxton 9 also reminded me of D09C. Both rubbers grip the ball quite well and attacking half long balls felt quite nice. The top sheet of the Rxton 9 felt super elastic tho which felt unusual, some ppl may like this, others not so much.
In terms of spin they are just good as any other rubber like 09C and boosted H3 national. Measured it with spinsight and on the top end I got 130+ rps against block, from both rubbers. I just find the spin generation of rubbers like H3 a bit overrated, it can create a lot of spin but other rubbers do the exact same.
TLDR: if someone is looking for a tack rubber that has afaster base speed and throw angle than a boosted H3, then a boosted Rxton 9 is a good option. Rxton 7 (37deg) is a great medium hardness rubber if you are looking for a very controlled but definetly not slow rubber.