Yes. I like their quality as compare to other manufacturer which provide buy 1 free 1 promo. I have asked before, for single layer, the price is about RM1.7k as you mentioned.
The reason I prefer double layer,
1) Can let 1 layer open while still having another layer locked for better air flow. Door in door design can do so, but opening the middle portion looks a bit flimsy.
2) Before opening the door, I can have a clear view of the car porch, just to avoid any robbers hiding at car porch and waiting for you to open the door at dawn, as I have to leave my house early morning to work.
However, there are some thing to be noted when using double layer, the door frame thickness is 8", which might looks slightly protruded out from the wall if the wall thickess is only 5-6".