Disappointed that the first four items I tried to buy said they'd been added to my cart but then were gone when I went to check out (less than a minute later).
Wish that there was a way to easily filter by series. Book listings aren't always consistent. Sometimes they list the series, sometimes they don't.
That said, I still greatly appreciate the excellent prices and free shipping. And I find that the filters that are available on the site work quite well. I especially appreciate being able to filter by format.
I debated whether to give four or five stars. But really, despite any minor frustrations, I am a big fan. I recommend Book Outlet to everyone I know. And I keep coming back again and again.