The Trumpeter E-100 kit comes with vinyl tracks that do not glue easily or hold paint so these are greatly needed if you want to improve the look. They are tedious to assemble because each link is 4 separate pieces & you have need a .5mm drill bit to clean out the pin holes so the wire goes all the way through. You need to superglue the wires in so they don't walk out during assembly.
Make sure you do not get the two end pieces mixed up while assembling. One end link has insertion holes for the wire & the other does not. They both look the same so keep the parts bags separate to avoid confusion.
Functionally there's nothing wrong with these tracks, they are good quality & Fruil does a great job replicating them. They are just tedious & take longer to assemble than the kit they go on.