We followed instructions to the T. The best we could get was a slight fluff to the cream. It never "whipped". The balls are hard to dig out and I could picture one getting accidentally swallowed if missed. The balls are a rubbery material that is difficult to clean. It was a fun idea, but we tossed the balls after the first day and just used the jar for storage.
This product is advertised to work with any type of cream until you read the instructions where it states that UHT cream must be used and not fresh or organic creams. This seems like a big detail that should be included in the product description and there is also no explanation of what the acronym UHT stands for.