Is a Koetsu Rosewood Sig Overkill for my JMW 9Sig?

Audiofeil has made many negative comments about JMW-9 on many posts, but never gave solid reasons why JMW-9 was not worthy of a world class cartridge or even a Shelter 901. Many fine arms are only 9" long, SME included. In fact, VPI loves the JMW-9 so much they favor JMW-9 over the 10 or 12 internally. That explains the new 10.5i on the Aries 3 because the plain 9 surpasses 10.5 and 9 Sig is even better.

So my vote is to go for it, what is there to lose? JMW-9 cutout is same as Rega and that's probably the only arm that will fit in that hole without getting a new plinth to cut for Graham Phantom. I am sure Phantom is a great arm, or even just the 2.2, but 9 Sig can stand on its own consider the price difference.

Audiofeil is making the assumption JMW-9 is the same as JMW-9 Signature just because they share the same name. Manufacture can change their model name to give people the impression it's new and improved instead of just an upgrade. So Graham 1.5, 1.5TC, 2.0, and 2.2 are all similar and should all sound the same?

Not trying to defend for VPI and I do agree VPI builds better table than arm, but don't make assumption on things you have little or no experience of.