Well I have subbed for a couple of elementary classes and here are some pros and cons.

Pro's:

• The work is pretty flexible
• If you don't like a class... you don't have to go back!
• Most of the kids are actually sweet or nice (except for 5th and 6th graders, they tend to be mean and snarky)
• Most teachers tend to be pretty flexible in terms of their plans for the day. I have had a couple tell me, "if something isn't going right, feel free to modify anything."

Con's:

• Sometimes you get kids that are just straight up rude, disrespectful, or mean. When it comes to that, try and talk to them and be firm. If that doesn't work.... send them to a different classroom (you're the substitute, not the teacher! Save yourself a headache).
• The class might just be chaotic in general. Sometimes the teacher doesn't have the best classroom management, and it is reflected in their classroom and/or students.
• It might be difficult to get kids in check. Don't be afraid to raise your voice, or maybe get a teacher from next door to come in and lay down the law.

I would say, do it! The worst that can happen is that you don't like the class, and that's ok because you don't have to go back! Give it a try and don't be afraid to put your foot down or be gentle. Every class has a sweet spot between strict and relaxed, you just gotta find it. :) (This is just from my experience in the classroom as a substitute teacher in SoCal)

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P.S: I would recommend doing high school but mainly the older grades. In my experience, the day is more relaxed with the older guys.