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Initial impressions
Interface is clean. The LiveCD came up quickly. Live CD boot options included Live, Install and Graphical Install. This was a great improvement over Lime for which I never got past the initial green screen with the dots.

Installer
The graphical installer looked like a good option. It reminds me of Windows 95, in a good way.
Install screens were clean and quick. Nice colours. Choices were clearly marked.
Interesting that it asked for the password for a new user account without showing the account name. My new account name is "User".
Disk partitioning was fairly straight forward.
System install took awhile.
No root password.

In the Activities menu the names are cut off if using a low res. Possibly when running in lower res the text should be shrunk. The whole menu could do with some shrinking.
Local disk install is 4.5G or so.
Changing the display to a higher resolution was easy. The interface seems to be designed for 1280x1200 minimum. In 1024x768 the Activities - Applications is squashed.

After local install the apt update failed. The error message referred to a public key not being available.
System update throws open an editor session halfway through which could be confusing for newbies.

The default for alt-tab is annoying as it switches programs but not between instances of the same program. No doubt there is a config change to fix this.

I didn't tried to remove Systemd. Given that this is based on Debian it could be be removed. http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_jessie/sid_installation. Given that this is based on stretch I didn't give it a try this time.

May need to increase the screensaver timeout as the 5 minimum default is annoying.

Never actually got TOR to work. This may be due to a network issue.
Strangely, when running Tor-Browser from the Live CD from Applications it downloads the browser first. In the Live CD. Expected to have a version already installed and waiting to use when booting in the Live CD mode.

As usual with Debian based systems an apt-get update was needed to get the ball rolling. Wondering when apt repositories will be available via BT instead of static downloads.

There was a slight problem with the Live CD mode where it locked the screen. The FAQ was helpful.

Overall it looks pretty, is stable, can install and run Debian packages, and for a quick run over looks to be a viable Debian based OS. Some issues with getting web apps running, but given that this is alpha it is expected that there will be issues.