I understand the troubles you are having. I just made my first purchase with them last month. When you go to their site you will be greeted by the "maintenance page" and that is about it. If you made an account and were able to log in you did better than me the first time I tired to use the site.
The storefront isn't open 24/7, it's open only on announced Monday's at 10AM Mountain time. The store doesn't have their full range available, only what they advertise in the newsletter. The ability to purchase that day ends when they sell out of things and that part of the site will disapear. The website is pretty bare bones, if you want information on the strains they have a strain guide accessible from the "maintenance page". I was also a little off put by the overall feel of the site, but I think it was really more of my expatiation of a, for a lack of a better phrase, "modern" web site. Theirs kinda takes me back. I'm new here but figured that so many people speak very highly of them I would give it a shot. Everything they said they would do, they did. The store opened up at 10am, I made my purchase, 9 days later it was in the mail (they say 5-10 processing days), it got here safe. I can't wait to start with my first grow.
At least on the day I bought the site was hammered. Meaning that it was struggling to handle the traffic, so if you clicked on a link it may fail. If you click again it may boot you out to the "maintenance page" or blank out. It took several tires to get what I wanted into the cart.
So you just have to wait for an announced Monday, make sure to log in at 10am Mountain time, and stay persistent. Good luck.