Many of the new cities coming onboard this week are mid-sized urban centers like Baton Rouge and Wichita. You're particularly well-served if you live in California, the Carolinas, Pennsylvania or Virginia, as Lyft will be available in multiple new cities in each state.
The company will still have smaller coverage than Uber, which hit the 300-city mark in mid-2015. There's also no word on international expansion, which is Lyft's historical weak point. The firm has partnerships in other countries, but it's not nearly as ubiquitous as Uber outside of the US. With that said, the surge in expansion is important. This will increase the chances that you have real ridesharing competition in your corner of the US, and might increase pressure on Uber to match features and offer better compensation to its drivers.