in the double walls of the bowl. You freeze (usually for 24 hours) it and it serves the purpose of the ice/salt mix in freezing the liquid ice cream or sorbet. But you only get one batch ..... that's it.
I have an accessory for my Kitchenaid mixer that works this way. This one:
But they also make stand alone models. I had one by Krups (a normally trustworthy brand) that was crap. A nut fell off a screw inside the unit, it made a huge noise, and the motor promptly jammed. Naturally, it was juuuuuust out of warranty. :grr: So, based solely on my own experience, I'd eliminate them. I've looked at Cuisnart's machine and it seemed pretty nice. But like the Krups, it was all plastic. It did, however, appear to be a better design (better in how the motor interfaced with the beater and bowl. The Krups' design should have been my first tipoff that it wasn't long for this world.
I'm sure there are other brands, too.
As to the way they work (the ones with the eutectic solution filled bowls) they seem to juuuuust barely get the product frozen before they get too warm to freeze it anymore. With any of them, you have to take the frozen (more slushy than frozen) mix and harden it in the freezer before you serve it.
In many ways, it all comes down to price. I don't know what you want to spend.
This guy is a home unit but exceedingly high end. A Musso, made in Italy. It is about $600! It uses an actual refrigeration system inside it to make the bowl freeze. This will do batch after batch without the need to refreeze the bowl for 24 hours.
DeLonghi is Italian, too. This unit, also self contained, is about $400. If you're price is in this range, I'd go the extra $200 for the Musso. It is made to a much higher standard - probably more than $200 worth. This one has a lot of plastic on it.
This one's by Simac, also made in Italy. Also self contained. It is also about $400, and also all plastic, where the Musso is stainless steel.
Then there's a big jump down to the eutectic models. This is the Cuisinart. $50.
Here's the Krups I had. Its actually about 10 bux more than the Cuisinart. You can see from the pictures that the Cuisinart has the motor built into the base. The Krups has the motor as a removable part of the head. Bad design, I think.
Then there's this Donvier. Its about $40. It uses the eutectic bowl, but is a hand cranker. I don't get this. Why a hand crank. Reliability? Exercise? Anyway ... its an option ....
There are comparable products from many other makers, too. Panasonic, Rival, etc.
In the end, I see only two choices ... at the top is the Musso and at the 'consumer' end, the Cuisinart.
Or, just go here .....
or follow this guy ...
:)