I don't have Panasonic one but Sharp's (purchased 8+ years ago) and other appliance (i.e. bread maker, hair dryers from Panasonic and rice cooker from Zojirushi, etc.). Haven't had any issue and they are all working well & great.
One of my friend got the "step down transformer" for his coffee mill (to control the granularity level). It is very tiny (like a plug) and it works according to him. Just in case if you have any concern.