I've been using Start11 for a few months on Windows 11, and it's been a pretty smooth experience. Performance-wise, I haven't noticed any significant slowdowns, which was a relief because that was a big concern of mine initially. The customization options are great for regaining some of the features from earlier Windows versions, like the classic Start Menu layout.
One thing to keep in mind is to always check for updates since compatibility issues can arise after Windows updates. The pros definitely include more personalization and familiarity, but on the downside, it's another third-party app to manage. If you're nostalgic for the Windows 7 style, I think it's worth trying.
How's your experience been with Windows' default Start Menu so far? Maybe we can compare notes!