I responded yesterday, but to the best of my recollection I've never seen anyone on this site who's had 3 levels done. I think a few disk replacements, but mostly fusions. That may not be an indicator of anything, although this sounds like an ambitious procedure, to say the least. But people who have had successful outcomes are less likely to be posting here.
What is making you consider this surgery after having had 5 others? What are you hoping for - and what is the likelihood you can get that? And like I said, I'd be searching the medical databases like Medline to see what the research outcomes show. I suspect there's very little research available on this, as I've never come across it. How many of these procedures has your surgeon done? What are the outcomes? These are just some of the questions I'd be asking.