This tool is fabulous. Before I proceed, I'm speaking from more of a PM or low-to-mid level developer or tester perspective. If you use the developer tools on your browsers you'll want this, particularly for inspection and checking resolutions. I know you're probably saying "just keep using the developer tools". I use the developer tools on my browsers all the time, particularly Chrome. And God love Google but it just always seems like there is just too much going on. One of my biggest pet peeves is all the panes. When I'm inspecting elements, which is something I do daily, I just hate the way it displays everything but the kitchen sink below it. I just want to see this pane and adjust as I need. I swear though, when I close something I don't need, it closes everything else I'm using. Frustrating HaHa. Something so small I know, but it drives me nuts when inspecting. Just this feature alone on one screen without all the other stuff is fabulous. I still use all those other things but I like I can just look at one thing at a time and as needed. It's the little things for me. And I like that it's not actually attached to my browser and is an app.

I can't speak for a heavy, duty developer. I'm speaking for someone who might be a PM dealing in web clients. Or someone who is responsible for testing sites. Beats paying for something like BrowserStack. Although great but sometimes when you buy tools like BrowserStack, you in many cases get a lot of great features you don't use or need. I am a less is more kind of person.

Looking forward to see what's on the roadmap for the developers on this product. Love it!