Depends. What's the application you're aiming to deal with?
If you want to get an idea of what you're spending on electricity for a computer, I'd imagine that it's fine. How much are you going to spend on this thing relative to how much are you going to save via optimizing any electricity use?
If you're building a prototype for something that you're going to build hundreds of thousands of units of and you need to size a power supply for that product, and care about knowing peak load, it's probably worth getting something fancier.