I bought some of those last week & I think they're great! I bought a marked needle plate for my 201 last year. It's nice but I thought it kinda took away from the vintage look. It's got a matte finish so it didn't match the bobbin cover plate exactly. And it was a bit thicker than the original so, it sat just slightly higher also. Yeah, I know....I'm a little too picky!
Anyway, last week I bought the stick-on markings for my White Rotary. I liked them so much that I switched the 201's needle plate back to the original one & used 1 of these.
I like buying from Sew Classic, too...fast (& cheap!) shipping & great service, too.