I use a cooler as my cooker and started making a sous vide fitting to do so, while maintaining the integrity of the cooler.
The advantage being I don't worry about evaporation when cooking over a long period of time. Plus, I can cook huge roasts with no problem. Anyway, I've never posted anything on line before but you can let me know if you're interested!
And, I'd be happy to show you pictures if you can tell me how to do it