Gess it's up to personal preference,some will like to use left top thumbs others the onscreen thumbs,Personaly i don't find any of the two positions ideal.As i said(to me)it's so much nicier to have two rows of thumbs pics below the stream screen,at some point becomes second nature.But at least we have previews pics,being in top left,onscreen..but they are there and that's good.