I installed 5 Alpha VS5 fans in my house and so far there is no problem. When u choose a fan remember these points:

Number of blades
Go for a 5 blade fan as it creates more wind (usually) but not always.

Length of blades
KDK fans have the longest blades of 60 inches. Alpha fans have max 56 inches which is still sufficient. U dont want too long blades unless its in the hall area.

Type of blades
The metal and ABS types are the best compared to wood as they dont sag after some time. KDK 60 inch metal blades will sag after some time due to its weight so best not to take the long ones. I find the ABS blades good as it is rust proof and is silent and smooth.

Remote Control
Always get the radio frequency type compared to infrared. Radio type u dont need to aim it at the fan in order to use it.

Motor
Get a 5 speed RPM 90-250 fan for better wind. The higher the RPM the faster the fan blades will move for that particular speed. Your motor should be a minimum 188. This represents the strength of the motor in moving the blades.

Warranty
Alpha gives 3 years for motor warranty. I think KDK is only 1 year.


CONCLUSION
I chose Alpha VS5 because it has better color and the fan gives me good wind. Some fans only give good wind if ure directly under it. Ive noticed this in some models of Elmark. But Alpha gives u wind all around. The fan is quite silent even at Speed 5 which is good. If ure interested in Alpha fans remember that there is not much difference between VS5, V8, V10, V12, etc. The differences are in the length of the blades, type of remote control and motor strength. Use the criteria given above and u wont go wrong with your choice.

The current selling price for Alpha VS5 fans is RM 270 only. I have been to many shops in PJ and Puchong and the price differs from RM 290 - 550 for the same model which is ridiculous so dont get cheated. Go to this shop in Damansara Uptown called Sangyou (facing LDP) and get your Alpha fans there. Thats the cheapest ive found so far. The lights and other fittings there are more expensive compared to other places but Alpha fans are cheapest there.

There are many other brands in the market but dont bother trying them. All look good at first but later may not last. KDK fans will surely last a lifetime but brands like Alpha are fast catching up. Alpha also has good customer service and they will come and repair your fan if there is any problem. KDK wont.

Hope this info helps.

Cheers!