That they are happy to have you come visit means a lot. I would take the meat. It has to be better than feedlot meat no matter what they supplement on top of their pasture feed. You'll have a chance to go visit the farm. You'll get to eat the product and if it's good, you'll know whether to place an order when they're taking large orders again.
Please note that depending on where you live, having 100% grass-fed might not actually be practical or even the best thing for the animals. Where I live, natural grass is seasonal. What will the cows eat when there is no grass? We have two local farms and one feeds the cows oats. The other irrigates to grow grass and uses chickens to fertilize the grass. Using natural rangeland and supplementing with oats is more natural for our local environment, but still involves growing a grain crop somewhere and shipping it. But irrigation and growing a crop of grass isn't perfectly natural either. I think either option produces a good product that is better than feedlot cattle eating cement dust and newspaper.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.