Price has gone down in past few days so I think this is the best price to invest money in bitcoin as price is expected to go higher in future which will result in higher profits.
even when the price was sitting around the $650 price level it was a good time to buy some coins for the long term. right now with the price below $600 it's even a better time to start buying. people should use this opportunity in their advantage.
Yeah this is really good price to buy as price is below $600 now so majority of users will prefer to buy bitcoins as we may see much higher price in coming months.