Hi, Did anyone have a real experience with Mug Warmer USB gadget? I mean, except for the fun of it, did anybody try to heat and drink tea with it ? It seems to me that it does not get higher temperatures than 40-50 Celsssius ? is it good enough? just for example, Satzuma USB Mug Warmer, http://ksp.co.il/?uin=15311 rgs DS