I've used both a few times today, but it is really hard for me to judge how "focused" I was. Did I get work done with them? Yes... but I also get work done without either of them.
I like how you have a lot of the science information on the site that explains it. Plus the sleep mode is intriguing, as F@W says it is for focus at work and reading only (via their whitepaper https://www.focusatwill.com/wp-content/uploads/2013/04/White...).
I'd like to hear a third party opinion that objectively compares the science behind both of them.
Thanks for the discount, I'd probably keep using so I went ahead and paid the $25. Even though I have been burned a few times by the "for life" purchases, I don't expect it to last for more than 1 or 2 years ;)