Finally managed to find time to head down to their showroom and Finally clear my questions abt Swingslide door aka pddoor.
The operation method is really special, have never seen before. quite innovative. 2 panels, one of which you can slide to hide behind the other panel and together with the 2 panels (combined together) you can swing open. (haiyo difficult to explain, if need to see visually, go to www.swingslide.com.sg and click at the door)
its Pros are : no bottom track, light weight, saves space
cons: acylic ones not so nice but phenolic ones too expensive.
quoted $299 for an acrylic piece. very tempted by the phenolic ones but costs more...