I started investing using SIP since april '05. As the table shown above even the NAV's of the all the scheme's i have opted are going up and not down. To say i have invested(right word is saved) almost Rs.25,000 till now. Its all happened because of SIP otherwise i would have ended up in spending that money. Eventhough getting less units month by month still i am happy bacause i am saving some money and not in a hurry for them.
If one has time to look at the market and considerable amount is available in savings account, they can go for purchasing additional units when the market is down. This might fill the gap of higher NAV when the market is up.