I have a Bosch gas range, it is well build physically but it does have some iffy electrical behavior. The spark plug spark on one of the burner but it just won't start somehow every time, more like half the time. I ended up lighting it up with a portable lighter for weber instead. The temp sensor inside the oven was iffy once in a while and the dial for the temperature control isn't always smooth. I'd say they aren't boring and reliable like the American brands, but much better than Korean as they get the basic right usually.
About slide in range. My parents were looking for one a while back and the only place selling them were smaller appliance place instead of the large chains. That's back when you can go there to get them from the warehouse in the back same day, instead of being forced to pay delivery like today. Maybe you should decide which one to buy based on your local availability, as it is less of a headache in case something happen and you need a replacement.