Very interesting. I actually posted this resource a few days ago. Did I, by any chance, lead you to that link?
Anyway, I would like to emphasis an important comment made in the link that you provided above:
understudy
Warning: the guy is pretty flaky over email. He's apparently a GMAT tutor in Argentina, where customer service is low on the list of priorities. He takes Paypal or money order and physically mails you the questions (I know - old school).
It seems that obtaining these questions will take some effort and time. I would advise you to keep sending him emails specifically informing him that you will definitely buy his questions. Also, PM
understudy for his input. Make sure to PM bb as well and inform him of the situation. As the founder of GMATClub, bb has some clout and might be able to get a reply from Golberg.
But please don't sacrifice too much time on this individual. If he can't respect customers, then he doesn't deserve your money. Period. If you run out of patience, move on to either the
GMATClub Tests or
Jeff Sackmann's math problems. I have used both of those, and they were excellent.
I wish that I could offer you more information or advice, but Goldberg is a relative unknown. Hopefully, this dilemma will be resolved soon. And if you do use Golberg's quant questions, please provide us with a review. It will be much appreciated!