When I transferred my Roth in last year, there were a few bumps. I did the online setup, then printed the forms, signed them, and mailed them off to Vanguard. Then nothing for a couple of weeks. When I called to check on the status, CS was polite, but informed me I would have to do a different
set of paperwork and get a medallion signature. Yeah, I thought it was odd they didn't know that I needed a Medallion signature until after they got the paperwork. After I mailed in the paperwork with the Medallion, they got my Roth transferred after about another 10 days. It was frustrating at the time, but since it got opened, I haven't had any more problems. I did get a few more odd messages, even a couple of months after the fact, saying "Your transfer is now complete!" I just assumed maybe there was some internal paperwork behind the scenes that was finished, and ignored it.
For the taxable, I opened my account in January. The only bit of annoyance there was when it asked "What is this money for?" I checked "Retirement", and it tried to set up an IRA. I had to go back and choose "General investment" or something, because apparently one can only save for retirement in tax-deferred accounts.
Other than that minor
annoyance, opening the taxable brokerage and contributing to a mutual fund was painless. I did check on the cost basis after reading this thread, but everything looks exactly right.
So, overall, I'm happy with Vanguard right now. I will be a bit more wary, and possibly make sure I keep good records just in case there is a problem down the road.