Steamers are great for steaming, naturally! OTOH, you can get the same result by using a double-boiler or any other pot with an insert. I've even used my regular cooking pot with a big strainer set inside it. Depends on how big a batch you're hoping to cook, I guess.
"Healthy" is the nutritional content of the food. You can get that by many methods. Rice isn't on my radar anymore, alas, so I wouldn't be using it for that. I do have a steamer; it has a couple stacking baskets. But I find it's more of a nuisance to pull it out and use it than to just put things in my steamer pot. I think it would be more convenient to use a multiple steamer appliance if I was making something with several components, though.
Depends on your plan for usage! More gadgets don't necessarily make for better cooking. Don't get carried away: I have so many thingies here I can't even get to them all. My kitchen isn't big enough to keep them out where they can be used easily!