I like this product a lot. Our lab synthesizes dozens of plasmids a month, and typically we use Gibson or Hifi assembly. I was hesitant to try this product, but it works exactly the same way. I have assembled plasmids with 2-5 fragments, and of course the 5-fragment assembly was less efficient than the 2, but I still had 100s of colonies. My one constructive criticism would be that it would be nice to have data regarding the best ratios to use per fragment size on their protocol. But I went with 1:1 molar ratio for fragments greater than 200 bp, and 1:2 for products less, and it was completely fine. Overall a good product!