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Makes it harder to clean, init. Also noisy, always popping out of the stupid fixing in the centre that spins it. And if you over fill your soup bowl the cheaper less finessed 'waves will spill your soup when the rotation fires up. Robs you of vertical space and the manufacturers provide the aperture size and not the plate-top to ceiling size, so fuck knows if your rice cooker will go in your diminutive microwave.
Apart from that, fine.
I've been trying to work out why the spinny glass plates are so bad, but I'm failing to see it. What's the big advantage in losing the big glass spinny plate? The one in my £20 microwave from Tesco which I bought 10 years or so ago consistently fails to annoy me, and I'm worried my standards are lowering or my levels of tolerance increasing.