It's true that you make money with money, but buring 1000$ in a week isn't that funny for an adwords beginner. I would always use a max budget a day. I you can reach it (depends on many other factors) in a good manner, you can always decide to raise the bar a bit.

The worst scenario are unlimited funds, and bad campaigns. There are professional companies that are proud that they get 100 kliks a day for 400$. That's 4 dollars a click. What I first want to know is what the smart adwords user is paying for that same click. If this is a mere 0.10 cents, then the company isn't doing a good job at all.

I use a max budget a day, simply because I don't want to get a heartattack after a week orso .....

Btw...tested a new landing page for my company (job vacancy), Quality Score is perfect...I entered a max per click of 1$....instead I pay 0.04 cents (thought the keywords aren't that well sought..)..