Having the meter is only useful if you learn how to make use of it, though.

The meter is useful for checking that you aren't exceeding the ratings of ANY piece in the system. That means battery, ESC, and motor. Knowing that your system is drawing 37.6 Amps does you no good if you don't realize that the battery is only rated for 25 Amps peak, or the ESC is only good for 30 Amps...

The meter is also useful for finding problems. In a 30 second run, you can watch to see what the voltage does. If you see it dropping dramatically, you know that there's a problem. Either the battery has been damaged, or you're exceeding its rated capacity.