Kneer Parallel Sliding Door Experience

Because PSK are significantly cheaper and can be tilted.

One more function and still cheaper? – that alone should give you something to think about.

I – mind you, as a former aluminum window “factory owner” – consider tilt-and-slide doors as joke items that almost inevitably tend to become increasingly awkward due to their design. Of course, you could mitigate that by using only absolute premium components in them. But then nobody wants to pay for that.

Sliding doors are usually used at greater widths than one would solve with double-leaf tilt-and-turn doors – so correspondingly more weight. Adding a linear sliding motion on top of the fittings required for tilt-and-turn wings is no walk in the park.

From my point of view, this would be a product for a manufacturer who wants to pre-program their customer service revenue. I would think very carefully about that.

Do you really have so few openable elements that you have to overload them with functions?

One of my aunts had something like that (as a window) in her (high-quality) conservatory. I’m not a bad eater, but I always found the operation noticeably strenuous. Don’t be fooled by promotional videos – those can be made with perfectly adjusted fresh samples.