Another great use of a sealer is marinating really fast.
You also don't have to buy special bags to cook in, I use the normal cheap bags for boudin and I just drop it in a pot of boiling water to warm up.
Here's the video of how to use cheap plain bags using a strip of the vacuum bag to allow air to escape.
https://www.youtube.com/watch?v=yJU8Z9gmDw0