I’ve now been using Dia for about a week. Parker Ortolani just blogged that he was skeptical of the Arc to Dia transition, but he’s now convinced:
The success of Dia over the past few weeks has brought me back my roots, reminding me of the iconic Steve Jobs quote “people don’t know what they want until you show it to them.”
My experience with Dia has also been positive. Because I’m not a heavy tabs user — I rarely keep more than a few tabs open, and by the end of the day they’re all closed — I actually prefer the tabs going back to the top of the window. Obviously this was a needed change for the AI sidebar.
My only nitpick is the iOS-like text selection bars, which are distracting. I’m always accidentally clicking on them because of how I often double-click and drag to select text. This is on a Mac:

Using Dia is a nice reminder that there is very little lock-in with web browsers. Switching to a new browser is easy. If The Browser Company can’t make their business work, then I’ll switch to something else.