The product performs as intended, but there is a bit of a learning curve for beginers. It's important to not oversow the tray as seeds will expand after soaking, but even if you presoak seperately the microgreens will grow too densely and increase chance of mould.
The sowing density will vary by species, just something you need to learn through a bit of trial and error. I use distilled water to get started, and move to tap water to finish the microgreens (fresh running water).
Jars with cheese cloth are better for sprouting, just because of the simplicity of it and never having to fiddle with it; but this has grown quality microgreens (Radish China Rose) really well and i'm still experimenting.
The product is great, just be aware there is a learning curve and there are external factors to consider.