Pros: Cheap as dirt. Annnnddd that's it
Cons: Cheap build quality (you get what you pay for), misaligned screw holes, pointed edges that more expensive cases don't have, poor looks (have you ever seen a bada** case for $25? Me neither :P), harder to install drives, and especially cheap fans. Terrible airflow. I have bought a case that came with only one exhast fan... that was DOA!
If I were you, dip a bit more moolah into a case. The upgradability will save you time, money, plus you won't regret it.
My best guess would be dipping at least $60 into a computer case. Seeing as you may only want to dip very little, I would like to give you some advice: research! A $25 dollar case would last you maybe a couple of years IF AT THAT. You'll save more money dipping into a $60 case that would last you maybe 5-6 years instead of dipping $25 into a bottom line case with little features.
I would recommend this case:http://www.newegg.com/Product/Product.aspx?Item=N82E16811119068
For 60 bucks you get a toolless design with more upgradablility than cheaper cases on the market, plus a sleek look. Thousands of neweggers have reviewed this case. Out of around 2,500 reviews, almost 75% are 5 eggs.
Please take a second thought on how much you spend on a case.