Solidly constructed cables. They are the length I need, tested and rated. So much easier than making your own cables, and more reliable. The flex boots are great, don't get in the way when you need to disconnect equipment but protect the tab on the jacks when you're pulling the cables through cable management.
These cables (the FLEXboot series) are my favorite network cables around. The boots provide plenty of strain relief, but the tab protection cover is super easy to depress. Fully enclosed boots/ tab covers are a pain to unplug, but not these.