It is not enjoyable as ebay puts it, because any dehumidifier is probably not....
Having rejected the cheap chinese ones of a similar design (copied?) I somehow expected something more subsantial and efficient. For a relatively high price you get a cheap bit of plastic and bit of rough sponge which has to be fished out awkwardly to replenish the moisture.
The sponge is tiny and might keep the guitar hydrated for a short while but it will not rehydrate a dried out guitar. Probably no worse than other similar products though.