They look nice but for me, I think they'd be too slick. I fished one afternoon in about 30 degee weather. Of course it didn't warm up over night and I didn't even think of the cold when I was launching the next morning. I unhooked the winch strap when I took off the tie-down straps. Luckily, I don't unhook the safety chain!
I like the carpet covered bunks (at least in above freezing weather. I fear the plastic would be nearly as slippery as ice. That said, I do launch my boat solo about 90% of the time. The plastic bunks would be nice when loading since I'm they guy cranking the boat the last few inches to the bow roller 100% of the time.
The South End provides useful resources and discussion forums for those that fish The South End of Lake Michigan for Salmon, Steelhead, Perch, and Bass as well as elsewhere in the Region and Chicago area.