I use the service in Colorado (Just south of Denver), but it's supposed to only work in California. Your experience may vary, but mine has been good enough to easily play games like Fallout (with tons of mods) without issue, but it was slightly too delayed (I'm well outside the region it's designed to work in.) for competitive games like OverWatch.
User for about 6 months, it's a really great product when it works. Three times I've had issues on a Friday evening / Saturday and there is (was?) No weekend technical support, so my issues wouldn't get resolved til Monday, meaning a few weekends I wasn't able to play games at all.
Twice my shadow has been unfixable, all I did was play games on it, forcing them to reset my device so that I lost everything I had saved on
The service is amazing, completely feels like a local ompute!