well i think im about the happy medium or average, im just a little over 7" so go me.
and you really think about it you dont want one too much bigger ( you dont want to hurt them too much ) and defiantly not too small ( where is it, can it ever go anywhere, for them and you ) i think im good.
however it leans to the left slightly, not that much but it does bother me... even if no one can tell, i can.
Grrr... does anyone elses bother them like that...lol
All in all 7" is fine by me.