I prepped the rails, they came clean with no shipping grease on them. Movement on all of the rails was very smooth, nothing was crunchy at all. I was surprised at the lack of a grease port on them, until I realized the ends of the rail carriage were dust covers. Once I removed them I was able to put Mobilux Ep2 (my normal rail grease) in with no problem.
One nice little thing I also noticed about the rails is that the top of the carriage is etched with the rail information, this makes finding the correct rail for each assembly step much easier, especially if the lengths are similar