Yes, Sony has a very distinguished history of making great-sounding portable players (though not all of their products have been great).
I do find their flagship pricing excessive, but these are low-volume products in 2023 and the A306 is cheaper than most of the Astell&Kern players.
I'm still listening to my portable CD player, the Sony D-EJ2000. It drives Alessandro MS-1 headphones and Sennheiser Momentum earbuds without a problem.
My main issues with Sony flash players has been price, battery life/replacement, and software. There are a lot of complaints about short battery life on the players, as well as operating system clunkiness and stability. Sony tried to fix that by moving to Android OS, but it's a work in progress.
The NWZX707-B ($899.99) and NW-A306-B ($349.99) are now officially listed as available for pre-order on Sony's website. I hope they end up being quality products! We can expect to see official reviews when they become available. I doubt I will buy one myself, but I'll pick up the 707 if it is Sony's last player.
From a value perspective, it's much easier to continue using my Apple iPod Shuffle (4GB) or my old iPhone 5S (32GB) as a portable player. They have great battery life, the 5S has a headphone jack and Bluetooth for speakers, and their quality is decent for portable use in noisy environments.