Many people don't end up using the tub much after the initial novelty wears off. Some people end up using them religiously. Some of them have very significant pumps (several HP), and use more energy than you would think, not counting that used to fill it up with hot water. Few people do the manufacturer's suggested (usually monthly) disinfection procedure. The internal passageways and pump can harbor some really nasty stuff unless cleaned on a regular basis.
I opted for an air tub rather than one with a pump. It also does not restrict the use of oil, bubbles, etc like a whirlpool does. It is not as agressive as a water jet, but is relaxing. It has the distinct advantage in that it blow dries itself after use, minimizing the required cleaning (I'm not talking the parts you can see, which is the same for any tub, but the internal passageways). It also won't be damaged if someone turns it on with too little or no water in the tub like a water pump can be.
I ended up with a tub by Jason (one of the sons of Jacuzzi). Whirlpool, Jacuzzi are essentially the same thing, like a tissue and Kleenex.