If you want to try out a "virtual" Freewrite, you can go to their Sprinter website and you'll pretty much be typing on a "Freewrite." (Fewer features, but the same general concept.) They even offer a free Postbox account, which allows you to save your documents to the Cloud (or, through Postbox, send them to Google Drive, Dropbox or EverNote — or download them to .txt files or PDF). I set up an account. I kind of like the environment (which surprises me a bit).
The Sprinter page...
https://astrohaus.com/sprinter/
Which gives you a link to the writing page...
https://sprinter.getfreewrite.com/
If I was going to buy one of these, however, it would be their Traveler. Half the weight (2 pounds, what the Alphasmart weighs) and it still uses a full-sized keyboard and has an adjustable angle screen. And it looks like they're going to put arrow keys in this one for editing. (It looks like the original WordStar concept for these.)
EDIT: Unlike the Freewrite, the Freewrite Traveler doesn't have a front-lit screen and it appears it might have a lesser keyboard. (If "scissor" keyboard means it doesn't have a mechanical switch keyboard like the regular Freewrite.)
Anyhow, you might want to try out Sprinter to get the Freewrite experience.