Hi Leon (Sineoji),
I just PM you
Cheers!
Hi Leon,
All thanks to your colleague, Dean, who came by this evening to resolve my problem. Found out that the PL1800 connected to my router is plugged into a renovated wall socket, which has caused the HPAV to my master bedroom PL1800 to fluctuate wildly between 200 and 850.

This led to the low DL of 150Mbps (though low, it was still 3 times faster than another brand's latest product that I just bought and used for just 5 days before I switched to Sineoji !!!)
After using another wall socket, which is not a renovated one but the original from HDB, in my living room to connect the PL1800 to the router, the HPAV to the master bedroom stabilised at 890-950. However, the DL only managed 280Mbps at best, most likely due to noise such as the internal rewiring during the massive renovation.
Next, he unplugged the PL1800 and plugged it into the first bedroom's original HDB socket just next to the living room. This time, the HPAV stabilised at about 1400.

I was amazed. Here my DL reached as high as 350Mbps.
I am very enlightened now. Dean is knowledgeable and clarified all my doubts and concerns.

This is the 2nd time he has come to help me in less than 5 days. First time he came, I was fully convinced by the Sineoji product after his demo. So I went to Challenger to ask to replace the other brand to Sineoji. Second time today, he cleared almost all my concerns.
Please keep up the good service and all the best to Sineoji's future business growth.
Rick