Mate for the money they are really good. Very sturdy. Ball bearing runners and fits really well. I'm very impressed for a Chinese, mass produced unit.
I actually had made my own, cost me around $300, plus the slide ($150)... which kinda worked better as it was a single drawer, a pull out table and the fridge was at floor level with a cover over it so you can stack stuff over the top. It had a ARB fridge slide in it too. But for a family, the single drawer was kinda too small. Now to fork out the coin for a drop down. But will have to sell the smaller Engel I have a few other things to pay for it...