It doesn't cost that much to repair, but it does cost more than your average gearbox. Previously, all our customers who had issues with their cvt8 we would just buy 2nd hand units from Japan and replace them.
We now use a mob from waterloo/alexandria to rebuild them. I can't exactly remember the costs involved as I don't deal with accounts, but I do know it does cost thousands, and most of that cost is dismantling and assembling the damn thing. I saw the g/b all apart once and I was gobsmacked on how complicated they really are.
But apart from the cvt8, they are a pleasure to drive. Incredibly torquey, great build quality and you have enough space to fit a family.