I go through Liberty Mutual for home/auto/life. Checked out Progressive & Geico and they both wanted hundreds more per year over what I'm paying. Yes I get a discount of some sort for getting all my stuff through Liberty but I can't imagine it's hundreds of dollars in discounts.
Also, the last time
they called me to see how I was doing, they ended up shaving $50/month off my combined bills. That made me quite happy.