Our Ikea oven was fine, one of the larger silver fan options. Never had a problem with it in the two years we had it. Looked great, reliable, cleaned up very well - then we moved house and had a ‘better’ brand oven (not much more expensive) which put the Ikea oven in a completely different light.
On reflection I wouldn’t buy another one and don’t think they’re very good value. Didn’t heat up as quickly, cook as evenly, heat a full oven as well as the next oven did (which although a big brand oven, was older).