You lucky bard... profits and greed are good. 

Ask yourself, do you really need the stock to lock profit or not ?
Do u need to use the profit and $$$ for cash holding for future opportunity, FD, landed property, business ..etc ..
Otherwise, let the stock grow yr net worth and WORK EVEN HARDER for you..

Note: usually all ppls worked very hard for money.. Why not, let the money work even harder for you ?

I would like to know more about the delay of 15 minutes and what will be the hit back, pros and cons of this.

Unless you're not using a live account, you should NOT get a 15mins delay quotes even with slow Internet speed.
Otherwise, if it is really Internet issue, I mean web browsing and watching YouTube will be 15mis lag too. Right?
Gosh... even email can travel faster than 15 mins nowadays in around the world.

Are you sure you got live eTrade account? 

however, i wish a big bear attack since i only able to buy my 1st batch. I wish to buy my 2nd batch at lower price, maybe 450?....but also need RM to be strong since i'm using itrade and it grabs current exchange rate. So it's kind of forex+stock 2-in-1 trade there, complicated. RM has been volatile lately, easily 5% difference in few days time.