I,ve fitted a few of these in the last few years, and I have one working in my showroom. The one I have experience of is the model that fits on the angle in the corner.
It is a very clever system, but it does have a few negative points.
Firstly, there is a lot of wasted space either side of the accessible cabinet. The cabinet dimensions vary, depending on which model you pick, but as European cabinets are in mm (not Inches..........!!!!), mine is 900mm X 900mm. I believe they also do one that is 1050mm X 1050mm.
I only tend to fit them in large kitchens due to the overall waste of usable storage space. Also the price of a cabinet from Germany with this system fitted in it, is a lot of money and it can put a client off when they find out how much it costs.
Another problem that has arisen with them is, if the Drawer fronts need to be removed and re-adjusted, they are a devil to get adjusted correctly. Even the slightest bit out of adjustment and they dont work correctly and the drawers stay open.
Having said that, as with almost everything from Blum, the quality of the fittings is excellent.
Hope this helps!
Tim (Distinctive Interiors)