I really dislike the grasping grooves ParaUSA is using on their slides these days. I know that one way to be visually distinctive in a market full of people making nearly identical guns is to go with a different style of cocking serrations, but the ones Para picked definitely emphasize style over substance.
They appear to have been cut with a ball end mill, and have a wide, shallow, semicircular profile that leaves none-too-sharp ridges between the grooves. Slather this with teflon paint, and you have a recipe for slipped grasps with dry hands. And a slipped cocking grasp on a pistol sporting a big BoMar-esque target style rear sight equals a trip to the first-aid kit for a band-aid.
Incidentally, somewhere between Blackwater and Roseholme Cottage, the LTC 9 also sprouted an ambi thumb safety. While the thought was nice, the CTC Lasergrips make it nearly impossible to re-apply the safety using the left thumb.