The 208 is quite a nice drive - especially with the Allure trim level.
Mine has the full set of toys inside, including 2 x USB, Sat Nav, fold-away wing mirrors, bluetooth, DAB.
The centre screen can be distracting, and you shouldn't attempt to change functions on the move, as you simply won't get through the menus. The Sat Nav is 'useful' but I won't praise it higher, and in fact I bought another TomTom for my 208.
Sadly my 208 is at the dealers, and I am going through the process of rejecting it as unfit because of a gearbox fault from new which took 3 trips to the dealer to even recognise.
When you say change functions do you mean something like
say changing from USB to DAB radio? Hit SRC (source) on steering wheel continuously until highlights what you want then choose, couldn't be simpler. Things like that are easy to do on move, or the list button is good to see choice of stations or music on iPod/dongle.
It's things like changing settings that take a bit more time,