I have been using my ion mug with charging coaster for  6 days straight now,   so far no issues.  I love the convenience  & where it takes no space at all. I do love how underneath the Ion Mug you have the button to Porsche what Heating temperature you'd want.  Temperature  is between  135- 145 degrees. You could change the temperature while it is  on the charging it doesn't get hot on the bottom of the ion mug I was very surprised love the feature . I like the black matte finish the charger is a nice size length of chord. I love the convenience that it stays warm for 2-3 hours when it's off the coaster. Easy to clean I had a girlfriend of mine come over she made her own hot cup of cocoa and she absolutely fell in love with it and bought it for her family so everyone has an Ion Mug of there own. thank you for this amazing opportunity.  #HomeTesterClub