Hiya,
im in the UK,

I too have my neurosurgeon and he has the last word, but never once when ive had a problerm arising has he suggested it was the shunt playing up, always quick to assume migraine, hense why he referred me to a neurologist and psychologist for their opinion, their answers came right back to the shunt! lol.

EXACTLY, the odds are in your favour, of course there are risks, but there are risks to everything that we do.
90-95%, would you spend your last pound/dollar/etc on a lottery ticket if that was your chances of winning a huge jackpot?
I know i would!!

The 5-10% chance of a complication is small, if a complication does arise, it can be fixed. Ild rather experience a complication from surgery than live with a malfunctioning shunt.

Please do keep us updated, and of course i hope the best decision gets made for you to make you as healthy as possible. =)
Take care =)