See video on Amazon.com The intermediate structural frame is made of sturdy, hard plastic, good material strength and meticulously crafted, makes a solid impression.
Washer and dryer are very stable connected (the included strap developed thanks to the belt ratchet enormous clamping force).
Through the strap and the anti-slip pads from slipping of the device is absolutely impossible.
Even if (as in my case) the dryer so deeply is almost twice as the washing machine, can be reached by simply laying on front of the retaining strap optimum support (see video). The extending table is quite robust, but really should not be charged with more than 10 kg.
Pitching time less than 15 minutes. Manual in German, color, very well illustrated and easy to understand.
Conclusion: highly recommended, I would buy again.