How good are these computers?

Honestly, if you are getting a desktop, you should just build it yourself because you will get much better hardware. For the price, those computers are complete garbage. You should be getting a much better computer for 700 dollars.

They seem decent, but just "how good" is impossible to answer, because a) "how good" as compared to what? Or b) "how good" as in "suitable to do what"?

I can tell you though that they both have a solid 4.2 on the goodness scale.