I used the knot boards a ton when I was planning my wedding. For my 9/19/09 wedding, we used flowers from weddinghydrangea.com for all of the centerpieces. They were gorgeous, and I saved a ton of $ by DIY. We did simple arrangements, 3 stems each, in low vases. People commented on how pretty and simple they were, without being distracting. The customer service was awesome and their recs for treating the flowers were spot on. My only blunder came when I left the flowers on my porch the day before the wedding, with the homemade "flower food" the company recommends already in the water. Ants got into some of the vases- since the flower food is a mixture of many things, sugar ebing one of them. We were able to take care of it, but it could've been a real mess. Hope this helps!
I gave them an A for my original reviews post. We did order extra flowers, because naturally not every stem is usable. Of the stems that we did not use, they weren't dead, just a little wilted. Overall, I am glad we went with them, and I would n't hesitate to recommend them, or use them again myself.