One con is that the drum throne seat doesn't swivel, which you will want it to do as you become a better drummer, but if you just want to buy something really cheap, then go for it, you can always upgrade later when you feel the need for it.

Are drum thrones supposed to rotate?

Some seats will rotate when you move while others stay completely still. Again, this is a matter of personal preference. Some people don't mind moving freely.

What should I look for in a drum throne?

The best drum throne should accommodate the weight of your body. It ought to be sturdy enough as well heavy-duty. A perfect backrest will also reduce the chances of back pains. So, choose a drum throne that will give your back excellent support.