After a week of deciding to purchase memory upgrade to 4GB or 8GB. I finally decided on taking the risk of upgrade it to the maximum hardware limit of my Macbook 5,1; 8GB. During those time I did some research and did not find any good review. Mostly said that its unstable and requires reboot after several minutes using them.
It’s been almost a week since the upgrade and I did not bump into any issues and felt a lot better now considering that I have more memory to use and allows me to open more application and leave them minimized if not used.