I tried the Lineage sleeve at the Apple store and it didn't feel like a good match for the rMBP. It did slide around and was a very loose fit. I loved the looks of it though. Obviously this is a matter of opinion, but I wanted the tightest fit possible. Out of all the ones I tried, THIS was by far the best.
Yea I ended up getting one of the slim sleeves as well. I was going to wait for them to release ones specifically for the rmbp, but had to get one because I'll be traveling soon. Definitely helped my decision that amazon had it for $18