I like BrowserStack, and I use it a lot at work, but it's way too slow to be part of the core code, test, debug loop, simply because it's far from a native experience.

As long as that's the case, support for Edge/IE is always going to be a second-class citizen for me. Safari, too, since that's only on Mac OS, and God help you if you need to debug web apps for iPads. There is no good way, and the only tool you have is a shotgun (dev tools don't always work with BrowserStack & mobile Safari, and we currently have an iPad, but no Mac to debug it with.)