the quality of products will vary. that product type is often advertized in newspaper insert magazines or on late night tv shows might be of lesser quality. i have no experience with the mentioned product.
i have a good quality quartz fan-less infrared heater. it works just dandy if used right. it doesn’t heat the air (to any large amount), it doesn’t heat the room, it does heat your skin very well sitting a few feet from it. it provides comfort and saves energy by heating just people near it.
portable electric resistance heaters with fans have been around for about a century. if you are in close enough to feel the fan breeze then you will feel some warmth. it takes a long time (and likely never will) heat a room (especially if drafty and less insulated).
in that type of situation i would dress appropriately. the low 50s in a house in winter is different than 50 in spring (short sleeves and beer party outdoors on the first day that happens). wear a good sweater, insulated or double pants, wool socks and insulated slippers, wear a hat. wearing the underclothes needed to be out in mild winter is OK. if you keep body heat then your hands might tolerate lower temperatures without discomfort.