It's the equivalent of a 'dedicated set up', it's just different. Instead of a set sized stirred or unstirred bath, these can be used in a variety of sized containers so imo they're better. You can insulate gastronorms and get the best of both worlds.
I have an Eiffel Fresherpack Pro, iirc. Ones which can properly deal with liquids are £££ - you need a proper chamber vacuum, but there are ways to include liquids without... freezing them, using food bags and displacing the air, vac packing with an edge sealer with the bag hanging down, etc.
yeah i was thinking could easily knock up a big insulating jacket for a large pan.
i wasn't sure if they were decent as the workings in a dedicated bath or just a miky mouse kind of immersion heateretc which could be widly inaccurate.