I engaged Optima, via Jerry Chan, for sliding door x3 + mesh (slidingx2, foldingx1) and all house windows (fixed, sliding and swing).
Would recommend Optima. Solid build and very impressed by the protection after they completed while my other reno work was still on going. The frames were taped up, the windows had a protective plastic sheet on it. Can embed alarms sensor in the frame as well (alarms from different vendor)
I didnt' get the double glazed windows due to budget bursting (for sound proofing), and yet excellent sound reduction/proofing.
Pricing wise competitive (not cheapest, not the most expensive either)
Jerry – responsive, attended to all my queries prompt (even after work hours), flexible and ok to arrange for 2 rounds of installation to time it with my alarms vendor’s installation
Once all dirty works completed, Optima’s team came to remove the tapes/sheets and did final touch up!
Just need to take note on:
1/ actual sliding door opening size – I did mesh and sliding door with 2 fix panel + 2 sliding open. Opening was slightly smaller than expected as the frame is really thick/wide and the sliding door handles eats up about 10cm on each side, thus reducing the mesh opening by 10cmx 2
2/ swing windows – hidden hinges (for security I guess), therefore can’t hold it in certain angle like conventional swing windows with “control bar”. With current strong winds/rainy season, the windows got blown by the wind and slammed against the frame a few times. Didn’t leave windows opened subsequently.
Would be great if optima had some kind of accessory to allow windows to open up to certain angles.

Cheers!