I was there last week. Thunder Mountain was shut down for quite awhile but we finally got to ride it towards the end of the day. I have to say, it was much jerkier than the Disney World version, which happens to be my favorite roller coaster. I kept saying "ouch!" during my ride at
Disneyland and wished it was over more quickly

I was very excited about the Matterhorn but that one was even worse! The beginning of Goofy's Flight School also beat me up quite a bit. Is it just me? Anyway, I hope during the refurb they smooth out Thunder Mountain a bit!