Agree with those that say "just listen" and then tell us your thoughts. I’ve never heard a Viv tonearm or even seen one in the wild but it does look interesting. Many people said that Kuzma’s new SAFIR tonearm that has a mass of 60 gms would NEVER work either. (Kuzma says is suitable for cartridges with CU below 25 and hence the tonearm resonance will be in range of 5-7 Hz which is preferable) But I was sent one to have a listen to and all I can say is WOW! Never heard a tonearm that sounded like no other before, it was like the cartridge was just riding in the grooves of the LP. I had no intensions of buying it but once heard it wasn’t going anywhere.
(Dealer disclaimer)