Here's my take, one year after I ordered from them: you have to be ready to actually do some gardening. The plants all appear to be fairly healthy, but many of them are extremely small and take a little coddling to get them to thrive. Personally, I prefer this over just going to the garden center and buying large established plants. It's more of a challenge when they are so tiny.
After work yesterday I was looking at all the perennials I put in last year. Most of them are doing well. A few didn't make it through the drought last year - but a few of them are growing like gangbusters. The Jacob Cline Monarda especially. I have to get some photos this evening...