[JEVE19]

I suggest you read the surgical outcome section.
That's where everyone has tried to leave their journey's details from day one onward.

Don't know of anyone, as of yet, who has received an M6 and had a bad outcome.
It's not just the disc, but the doctor who puts it in as well.
I'd go for whoever was most experienced. Once it's in, there's no adjusting it.
Experience really matters here.