I use glass when I'm doing neg composites but other than that i'm glassless. I always focus on the important part of my image then if theirs any random in and out of focus for the rest of the image I'm not bothered. the only time it's an issue if the neg pops during long exposure times. For that situation I'll use glass. Also I am in the habit of taping my negs flat to the carrier. Once I do create a neg glass composite. cleaned and sealed it never is taken apart so I only have to do it once. It's then filed in an envelope and stored in a wooden drawer.