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I am in Ohio, so I have Nationwide renters, but have never had to utilize it, thank God. I do have some friends who have had to utilize their Nationwide renters, and did not hear any complaints from them.
I am seriously considering switching to USAA, though, just because it is so much cheaper.
Many years ago when I was a renter, I would usually go with whatever company I had my auto insurance with, as noted by others, for the discount. Now that I'm a homeowner, I went with a company that provided the discount, but also gave better than average policy details, for both car and home -- Liberty Mutual. I've been with them for years, have never had a need for a claim, but have always gotten good service whenever I called for questions. They also will review policies with you, to make sure you have the right coverage for your specific needs. I'm sure there are probably other insurers who do the same.
You can check the JD Power ratings of various insurance companies here = JD Power Insurance Rankings Will give you a good overview of what other consumers think of a particular insurance company.
Renter's Insurance is an absolute necessity. No one ever plans for a catastrophe, but they happen. Better to be prepared.