We've had an outstanding experience with a mortgage broker affiliated with Wells Fargo in the Bay Area (CA). I remember hating all the paperwork of refinancing, but that was almost 7-8 years ago, and whaddyaknow, it's all online now! (Duh, right? LOL!) I's been super easy.
We're close to closing on a 15-year mortgage at 2.875%. We refinanced from a 30-year that had 23 years left and was at 4.875%.