MIES:
after 2-3 years, the surface is sticky and only difficult to clean, you simply can not contain more gladly.
Addendum: the older, the more sticky. Prefer not know which plasticizer therein. The unit is for 1-2 years to handle no more sticking onhne and not recommended!
Addendum jun2010: Meanwhile free replacement unit of Tivoli with new interface. The feel is as you could wish for, grip, slightly soft, but not !! sticky. Battery life with eneloops fully adequate for the supplied Sound. Therefore, now 5 Star