They sell a mesh sheet and a solid one for making fruit leather. The mesh does well enough unless it's too juicy. I've never compared the mesh types between the brands.The Excalibur is what I have, but tt's a bit of a monster. Also, I don't know about the Nesco shelves, but I bought the fancy sheets to keep things from falling thru, and it ended up $$. Also, the sheets I got impede circulation, in my book. I'm sure others have a better answer to that point. Does the Nesco have smaller holes?
As for filling it, I buy frozen small fruit and finish the fill with that.
\The most important thing is to follow instructions.
There have been a number of dehydrator brands that had an occasional model better than Nesco, but those models tend to change and become worse. Only the Excalibur is perennially rated higher than the Nesco.I've got a square off brand but I don't care for it. Dosent dehydrate that good. I would love to have an Excalibur but can't afford it and i've also got a round Nesco that does better than the square off brand.