I cooked rice in a plain old iron pot for 30 years without any problem.

That's a bit overcooked, even for brown rice. I'd say no more than 20 minutes.

What do you want a rice cooker for? It's so easy to cook in an ordinary pan, which has other uses too, you can use it for porridge or beans or soup, drink beer out of it when you've broken all the glasses, even put it under the bed (but wash afterwards if you still want to cook rice).