Got my MBP M5 Pro today. In a nutshell: it’s niiiiice. 
A few notes:
- Initial setup was slightly rocky, as the new Mac’s Migration Assistant refused to see the old MBP. Finally got it working by running a TB4 cable between the primary USB-C ports on each device.
- Setup took about an hour for roughly 750 MB of data. Not bad. Progress estimates were wildly off until it was about at the half-way mark.
- All of the expected re-authentications and re-additions of Apple Pay methods went well.
- A couple of anomalies: The Bluetooth icon inexplicably disappeared from the menu bar (easily re-added, but…weird), and my Arc browser seemingly forgot about an extension (Adblock) I had been using, which needed to be re-downloaded and installed.
So, was it worth it? For me, yes. It is noticeably “snappier” than my M1 Pro, and compute-intensive processes (Xcode compiles, simulator launches, etc.) seem to be about 50% faster. Definitely worth the money, especially considering the trade-in offer for my old one, free financing for spreading the payments over a year, and a little Apple Cash to boot!