With Cisco, you'll be on hold for 3 hours, until you read off your product serial number. Then they tell you you've reached EOL for the product in question, and offer to sell you an identical product whose only difference is the product number, at a vastly increased price. However, they won't tell you what the price is until you sign an NDA, because the gouge each customer differently.
They do this with pretty much every company they buy. Psionic and Riverhead come to mind quickly for me. The only reason they kept the Linksys brand was because they had no competing product at the time.
The real world is most users of MySQL don't care a damn about any of those. They care about which is easiest and cheapest to implement. So called MySQL experts are a dime a dozen. When you search Google for database software, you see MySQL on the first page of results, not Postgre, not MSSQL/SQL Server, and not Oracle. Lastly, other than standards zealots, who demands ACID compliance? In the real world, quality is often an afterthought.
"Intelligence without character is a dangerous thing." -- G. Steinem