I'm using it all the time as my main development browser.

It's been awesome using it. It's not just responsive design, it has fantastic features around accessibility and performance, I can set different viewports to different speeds and colour contrasts all at the same time. It is bonkers how powerful it is as a tool. I always recommend it to people to try out.

Using it for quite a while now. It is amazing. Even 'just' using the multi device view is mostly enough for me, but it goes a lot further with accessibility audit functions and such.

I definitely recommend trying it out.

I actively use it.

I'm pretty familiar with responsive design so I'm honestly not using the multi-viewport size set up that much. But it can also show dark/bright view next to each other, set up viewports with different networks speeds, and toggle various media preferences which is just super handy as these settings aren't that easy to toggle in default dev tools.

A nice extra is the page info pane which makes it super easy to validate all the metadata + check how the social cards show on popular networks.

been using it for a while. As someone who came to frontend development later, and responsive design even later, polypane's multi device view itself has helped heaps. in fact i feel guilty that i'm not using its full capabilities. the biggest thing though is the dev responsiveness to issues or bugs or just stuff u couldn't figure out how to do and why

no, but I do use https://responsively.app/

There's also Sizzy (https://sizzy.co). It's available standalone, but it's also included with a Setapp subscription (https://setapp.com — Mac app subscription service).

yeah, sizzy is cool, it's what lead me to responsively as these monthly charges just don't match how I use the tools.