Italeri bikes are nice, specialy in 1/9, allthou some are very simple others (like Ducati Desmosedici or Honda RCV) are nicely detaild (not Tamiya details but it can pass). Accuracy is OK as well as fittement of parts, no PE or metal parts in those kits (except screws and springs) and as the worse thing, there are no afftermarket parts (there are some but not that many as for Tamiya bikes). 1/6 scale is inlarged 1/9 so nothing new in there and for that size it is to simple.
Here are some of mine 1/9 bikes
http://www.hr-maketari.com/galerija/...ic/page_01.htm
http://www.hr-maketari.com/galerija/...ic/honda_n.htm
As for the F1 if you have patience they will turn out nice.