Personally, I'd wait for Acer's offering, waiting for something like a  i7, GT750M, Full HD Matte IPS display combination. Currently, Acer only has this, GT750M> GT740M (Lenovo Z400) > GT730M. Perhaps Acer might refresh their V3-571G-736b8G1T with a GT750M...who knows

V3-571G-736b8G1T, i7-3630QM + Nvidia GT730M(DDR3) + (1920x1080 IPS) @RM2899[2.6kg], 8GB, 1TB, W8

I don't know about the Y400 but the older brother, Y480 suffers from BAD viewing angles.

where u order from? US or local?

I think malaysia having similar specs, but without the ssd i guess.

Maybe less RAM as well.

yup..agreed..Malaysia set don't have SSD and the RAM is only 4GB (without free upgrade)..too bad..but the price also a bit expensive than US set..

so, how about warranty?? 

soo, Lenovo malaysia still accept international warranty even if it is US Set?? as long as got official receipt from Lenovo right?? 

Price should be very gooding also bro, should be close to RM4k or so (RRP of Y500 is RM3799). The Acer goes for RM2799
You guys first time going to PC FAIR ah? Most if not all laptops there sell at RRP. The "promotion" you get is some freebies or extended warranty usually

IPs screen will have better viewing angle than most of the traditional laptops screen with TN panels. But its rare to see in the laptop space. Perhaps, the future Y series will come with full HD IPS screen also, who knows. 
Local set Y500/GT650m sli is selling around RM34xx close to grey imported set at 3299 with higher US spec. It save the trouble for 1 to 1 exchange and major warranty claims issues. 
Pls ensure you get the proper official receipt/Invoice from US Lenovo or their authorised resellers in US. Check out whether the US international warranty cover full refund or 1 to 1 replacement major warranty claims in MY, just in case you are unlucky to get the bad apple. 

Looking forward for the poisoness reviews and benchmarks from you. 

oh..if like that, i'm feeling like wanna buy from Lenovo US too la..
can u help me? hehehe 

   
hahaha..i want higher RAM, 16GB if can.. 
for HDD, maybe 750GB 7200rpm or 1TB 5400rpm 

so far i only tested fifa 13.

No problems with windows 8 so far but i havent tested with any other games yet.

So far gaming experience is great except i cant get use to 14'' because my desktop used to be 21''

Other than that, it's very good   

You can't use the normal HDD caddy bay as quoted by u since it can't properly fit in Y400/Y500 with special design and size.
Garage sales selling Lenovo removable HDD around 400 is not so worth it. Better get mSATA SSD.

Here the pics for Y400/Y500 optional swappable ultrabay: