Never had a light leak or scratch from the felt. The Lloyd wastes less film leader than the others and is stone simple. OTOH, the ones with frame counters are probably more accurate, especially if you load a number of frames other than what's listed on the table on the Lloyd.
I've not checked mine with a flashlight, and can't without removing the film since it has a partially loaded roll of Arista Premium 400 (aka Tri-X) in it now. But it hasn't been a problem.