"Quick note first: I have rated both performance and reliability as GOOD but to be fair I haven't had a chance to see how the bars rate in those two categories because I have only just fitted them.
I found them east to fit and they do seem to grab the sheets well; the cap fits on tightly and is very difficult to remove once banged home with a rubber mallet.
You need to pay attention to how the gasket is seated before cutting, if you've cut the aluminum bar to length. It tends to pull itself along as your pushing it home. Once you've finished pushing the gasket into it's groove, do check that the other end hasn't worked itself away from the end of the bar before you cut to length.
All in all easy to work with; at this point I would recommend. Now we just need to see how they perform through the winter!"