I think I will not join that club. I'll keep on using my A4000PPC with a normal CyberVisionPPC. That is good enough for me.
I'm done buying second had Amiga hardware unless I can buy it cheap. In that department I had some luck though the last 6 months.
That said. I do have a G-Rex for my towered A1200 with a maximum BlizzardPPC. It doesn't have SCSI though. I can't say it works any better than a Mediator solution or just using the BVisionPPC.