They definitely look & feel like junk, but mine works great too.
Tangent: You see in the datasheets sometimes the erasure time for different types of exposure and I remember fluorescent light being one (I don't recall the time/dose). So a couple months ago, I put a 35 year old 2716 in direct contact with a 15W desk lamp tube for 3 days . . . it cleared 1 bit.