I bought my first car from a dealer at the certified used Honda dealership. Overall, it was a pretty good experience. I ended up with a great car that had no problems in the 4 years I owned it.
I felt better knowing that it was certified by Honda and I was also able to purchase an extended warranty for more peace of mind if I desired. The salesman was a bit pushy, especially since he was trying to meet a quota for the month (he admitted to us).
Since I purchased the car after business hours, he set me up with some insurance for the time being easily. The salesman was also able to get me a decent interest rate on my loan, since it was my first major purchase with credit.
I had a good experience overall, but would have preferred a little less pushiness. However, that is expected when you shop for a car I think.