I have Geico and I've always had them. They gave me the lowest rate when I bought my car and they still do cause every six months I get quotes from everyone else to see if I can get a better deal. One thing I do like about them is their mechanical breakdown coverage. It's basically a warranty for new cars up to 100K. It adds about $17 to my policy which is still a very good deal (about $210 for 100k). I have never made a claim and I suppose all auto insurance are good so long as you don't make a claim
Still, I'm paying about $1400 (includes mechanical breakdown) a year for insurance for a 3 year old car and no one else has a better deal.
I have Allstate for my home insurance. They give me a nice rate but the bastards wouldn't give me a worth while multiple discount for both home and auto. Plus I would have lost my mechanical breakdown coverage.
As for Progressive, I don't trust them because I don't think their "we'll give you a quote from other companies" accurate. No two drivers are alike and it just seems like a PR thing that doesn't really give you a meaningful quote from other companies.