I don't think you can get a double Neff oven with slide and hide, just single ovens. I'm just about to have my kitchen done and am having two single ovens, one Neff slide and hide and one combination oven/grill/microwave. They seem to get good reviews on John Lewis. AFAIK slide and hide is just a Neff thing.
I've had Neff before and they were good ovens. Miele are very good but £££££.