Panasonic NN-CF853W

It costs over £350 and it condenses heavily, cracks and sparks and yet Panasonic customer services weren't helpful at all. One of their service centres in Basingstoke collected it for a check and had it for 3 weeks! Apparently replaced a part but no difference. Im scared to cook a joint in it as smoked out the kitchen last time. Just using it as bog standard microwave which I could have got for £50 from a supermarket. Plus the digital programme pad SO small I have to put my glasses on to see it!