Vacuum Cleaners Discussions

Wondering what the big diff is between the older 80's Kirbys like Heritage/Legens vs the G series in say construction, suction, sound

I know the g series is easier to push but sometimes I like the old heavy sturdier construction.

I hear the G5 has a kevlar fan & its purpleish which is nice too but also interested in the Heritage 2 or Legend...

Thanks

PS how much should you expect to spend for the older say Heritage 2 models?