Forgot to mention that I live in Hawaii, so classroom option is out. I'm guessing this would have been the best option for me:(

I'm currently enrolled in Knewton. Although it doesn't have a physical textbook, it comes with a ton of online resources. Essentially, all of the information you would get from a textbook is just divided into videos, Powerpoint course notes, and additional chapters on information. You won't be lacking any info that a textbook would provide. The only issue would be if you are the type of person that likes to physically hold something. I've printed several of the lesson notes from Knewton so that I can carry a paper copy around with me.

I haven't had any experience with Veritas.

In addition to Knewton, I've also been working through the Manhattan guides which are often considered the best prep books. I had forgotten a lot of basic math concepts, so I used Knewton's engaging lessons for that, and am using Manhattan to dig deeper.

I'm in the same boat as NextGreatLeader. I'm enrolled in Knewton (just enrolled Thursday- on my second section and really enjoying it so far) and also have all of the MGMAT books. I picked up a Veritas book a few weeks ago as well but haven't started it yet- that book is solely Data Sufficiency since I feel I could use a lot of work on that.

It really is up to you, though. If you have the money to spend it might be good to sit in a classroom for that experience but I don't. The MGMAT books were highly recommended and the Knewton course which is extremely affordable, offers a competitive guarantee and is actually fun/interesting which is REALLY hard with material I've been looking at for the past 7 months now- create a pretty good mix for me. I can't really utilize the Knewton materials at the gym or on the train to and from work, so that's when I utilize my books.

But like I said, if you actually have a solid block of time in which you're able to study every night, it might benefit you to enroll in a physical class (most of them include a full set of books). While Knewton doesn't, it does offer you a ton of resources and the ability to go back and re-do most assignments which can help determine what you're understanding and what you still need help with.

Good luck!!