I refinanced with them last year and it was a "meh" experience. Their rates/fees were good, and the UI made it pretty easy to work with, but they were incredibly slow. I would have understood - it was a really busy time for refis - but the work flow would go something like this:

They'd ask for a document that they hadn't asked for previously and make a big deal that I needed to provide it to them in the next few hours or else we'd lose our rate, then when I did provide it I wouldn't hear from them for 2 weeks. Overall, even with an appraisal waiver, it took like 3 months for it to go through and I never waited more than a day to respond to requests for info/documents.