I managed to cut down on my BoB wishlist thanks to this - bought 13 books for ~$53 total over a couple of days.
I've never had any problems buying from BooksOnBoard (I've been a customer for about two years now); the only reason why I buy relatively little from them is that they have a smaller selection than Kobo or Amazon and the books are often a bit more expensive than Kobo (well, more expensive than Kobo with its frequent coupons anyway).