Forget about better sound (compare technical specifications - Astra is a downgrade from Expert Pro 1000).
If these advantages are enough to motivate your investment, then go for it and enjoy your music.
The Astra has Bluetooth and USB-C. The new remote app looks nice too (about time that got updated). 35% trade in is also pretty nice. Why not try a 14 day trial, and then tell us how much better it sounds?
The Astra is quite new so there is little to read online. There is one short user-review on the devialetchat forum here. It’s in German so you may have to use Google translate (or similar) to read.
Please note that the poster only has this single post on devialetchat. Quite unusual that an audiophile will not comment further on a new purchase.
The photo of dual Astras is just the amps unpacked, not connected and could even be from somewhere else.
I still trust what he says about the Astra though, but I look forward to impressions and reviews from others.