Summary - I have bought 3 of these. I have fletched 100's of arrows with them at this point.
1. Ease of use. All 3 fletchings at one time. And it is easy. Enough said!
1. The glue will stick to the plastic. You can easily fight this by coating everything with bow wax. **That is a huge tip btw! But my first one, I scraped the glue off so many times that I wore down the plastic and eventually i messed up one of the wings.
2. Plastic construction - After I messed up one of the wings by shaving it away, I bought a replacement wing to replace it. Literally the first arrow I went to fletch was a repair of one vane. I put the arrow in and had to spin the nock a bit to line it up. I was forcing it around using the E-Z fletch to hold the nock. And I broke the plastic tab that holds the nock. No repairing that! So don't do that. lol!
Bottom line - If you shoot a lot, you have to be able to fletch your own arrows. This is by far the easiest tool to get that done. I had a buddy say, "well I bought a really expensive metal fletching tool that is great". I have used them too. This is way better. Doesn't even compare in my mind. I have two of them. I fletch one arrow, by the time I get the second one done, the first one is ready for the next arrow. I initially gave this a 4 star rating, but I think if you have the best product in the category...you should probably get a 5 star rating. I think having a few metal parts would be a good idea. And maybe the ring that slides over the arrow that holds all the vanes in line could be a bit different (I can't think how, but seems like an engineer could tweak it a bit with a better design). Overall, I love it. Makes fletching arrows a relaxing and enjoyable part of the experience.