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I got a deal on one with WIFI and I love it. I use mine in a insulated cooler with a hole in the lid. I usually don't know what time I will get home till after lunch. I can throw in frozen meat before I leave for work, and then start the thaw and cook process whenever. If its going to be a long day I will add ice to the water bath.

Love my Joule. Been using it for years now it feels like for an amazing amount of things. Also the size and waterproof aspect of it is unbeatable. Good customer service too now that breville owns em.

I am not sure if cooking food inside a plastic bag is healthy.

For what it's worth, you can get reusable, resealable silicone bags which work well and are less likely to leach into your food.