Is the smaller OTR Advantium 240V big enough? I was initially planning on an under-cabinet MW, but since the Advantium can be used as both, I figured might as well get it, but it seems like most people here have the larger oven-sized one. Does anyone have the 240V OTR one and find it large enough? What kind of things can you cook that can fit? Besides price and having to switch the bottom section out, are there any other disadvantages compared to a plain MW? Thanks.