Barn door trackers work fantastic, actually. This is a comparison picture I took
Both images were cropped the same. Left pic. f/4.8, 20 sec, ISO-800, 32 mm focal. Right pic. f/5.6, 33 sec, ISO-400, 200mm focal, Barn Door Tracker.
So, zoomed in with the barn door tracker produced way less trailing, than being zoomed way out without it.
And this is the Tripod I have. It's quite heavy and solid. I'm very happy with it.