This is the pro and cons i can think of
Pro
1.No need to go and queue to buy the game.
2. less worry of loosing the disk.
3. i can redownload all my game copy if my hd crashed.
4. CD key is preserved and get streamline patch update.
5. just downloadn and put on queue overnight (since using unifi)
6. Go Green. (they dont need to make a dvd for me )
7. Can get promo online. (like BF 3 now priced at 32.50 SGD instead of 60 SGD.
8. super cheap when its sales time  cheaper than cpt jack dvd  (courtesy of JinXXX)
9. save space (courtesy of advocado)
10.No need to worry disc scratch til cannot read. (courtesy of advocado)

Cons.
1. Download sometime slow but today i checked my download speed is a 700 - 800 kbps (for origin)
2. Take bigger chunk on hd space (but i can opt remove the installation files)
3. cannot sell to others (courtesy of streme21)
4. If you loose your account, you loose all you stuff. (courtesy of advocado)

how about u guys ?