How does a collapsible cover compare with a plain plastic splatter guard?

It folds down for storage and is rated to a much higher heat than most rigid plastic guards. The trade-off is that silicone can pick up stains and smells, and it weighs more than a thin plastic dome.

Will it fit over a dinner plate?

At 10.8 inches it covers most standard dinner plates and medium bowls. Oversized platters and wide casserole dishes may be too big for it.

Can I use it in a regular oven or on a stove?

The silicone is rated heat-resistant to 500°F, so it can act as a splatter guard on a counter or stovetop. Keep the tempered glass top away from direct burner flames and broiler heat.

Wash the silicone and glass by hand with warm soapy water, working into the fold lines where grease collects. Check the maker's instructions before putting it in a dishwasher.

Does it seal the food while it heats?

No. It is a splatter guard, not a sealed lid, so steam escapes and food can still dry out. It keeps the microwave walls clean rather than trapping moisture.