These boards are pretty good and evenly coated, but the edges can sometimes be unusable. Generally you can go up to the edges of the board, but occasionally you may run into problems up to 5-10mm in. Dont get me wrong, these boards are predictable and ALWAYS develop time after time. Afterall, you wouldnt expect to go right up to the extreme edge of the board anyway. The resist at the edges can sometimes be UV damaged. I suspect that these are cut to size on a guilotine which is what causes this. Thats the only thing Ive noticed. Aside from that, predictable and always evenly coated. These should ideally be stored in the dark. When prepping in the 10-minutes before use, you certainly dont need darkroom conditions or anything like that. Only handle the edges of the board.