Yes, the device warms. Not just strong - there is only one step, no setting - but fußkalte people (which should mainly be women) would perhaps be pleasant. "Would", because the piece alone is practically not usable for heating: because the massage buttons interfere underfoot simply too much. That is to stand as on protruding pebbles, very quickly uncomfortable.
So realistic is the use for massaging, in which to turn the heat as needed. Whether the kneading of the soles (also without further adjustment) is really so relaxing but? I personally feel rather uncomfortable to painful. With a "real" shiatsu massage the whole course has nothing to do, because on the one hand by hand and individually oriented to the respective bodies, on the other hand it is directed above all at the meridians, the "energy pathways" that even with Acupressure and acupuncture are important. This rotating knobs in the foot warmer, however, are already very technical and impersonal affair. Apparently, "Shiatsu" an unprotected name, which must be set each. The sole is rather a case of the known reflexology where as individual organs to be stimulated via the stimulation of certain points. The Fußkneterei in this device stimulates this principle certainly also times something, but purely accidental and uncontrolled. Perhaps one reason for my bad feeling about this.
In fairness: Among the testers in the family, there were some who felt the kneading pleasant. Just a matter of taste - and who exercises such as a standing activity, the button stimulation may face even more positive. Personally, I would rather be run barefoot on the lawn or if necessary by the shag.
Can benefit from holding one the product is that it is not a cheap commodity, but made solid. The washable inner lining makes sense to follow the instructions in 21 languages on the attached Giant label are rather too cautious ("For too long use can cause skin burns," Well I want to see). On the dimensions there are also nothing to complain about, with my shoe size 45 I have plenty of free space. However, I end up with the heel already fast on the hard control part, are attached to the power supply and switch.