Had some serious issues with my Incase nylon sleeve last week. I posted about it on here but the quick story is that using it for two days created some ugly scratch marks on the lid of my Macbook Pro. I elected to go for the Booq Vyper M2 sleeve after doing some research online. I wanted a sleeve that zippered entirely around the laptop and was of solid build. I could not be happier with my purchase. The build of the sleeve is amazing. It produces a loud sound when I knock my knuckles on it and feels extremely sturdy. The sleeve also has a padded interior and the Macbook Pro fits snugly when zipped inside. The zippers have the Booq symbol on them and feel very sturdy. If you have a Penryn Macbook Pro it's a steal at $29.99. The M3 sleeve which is made for the current unibody model is $49.99. That might seem like a lot but it's really worth it. You can read my full review here at my blog.