The dish is very convenient because it is not hot, but it's true, my Ikea-plate extends beyond the the set. I find but not bad, the lid fits on the Ikea plates. The cover itself is ok, does not fit all, which I am doing it, but I know that already from other lids. But also never found one that always fits exactly to all vessels.
Watching you have but if, for example, the complete set with NEM small dish or cereal bowl ner used the condensed water collects on the plate, so you should not pick up with a large swing from the microwave the whole. Without the plates used the dropwise condensation on the turntable, if the vessel is smaller than the lid.
Although I think that's not so great, but I think that it is not on the cover, but in the nature of things. Whether that would be better with the help of more and / or larger holes in the cover, I do not know, so I can not blame the product first. The quality of the material, however, is good, you can do in the dishwasher, the set also.
All in all 5 stars for it.