original lowryder - slightly taller plants, low yield , mild high often short lived.
lowryder 2 - shorter fatter plants 8-18", good yield if grown right and an improved high, citrusy yet relatively low odor.
dieselryder - somewhere around 18-24" during flower, good yield, good strong 'up' high, quite stinky plants in flower.
Low lifes auto ak,WR, etc, same kinda growth pattern as Dieselryder, tend to be good yielders, with great high dependent on your chosen auto strain.
Basically Autos are fantastic for newbies, or those who just wanna grow small amounts of smoke for themselves, or like me, to fill out empty spaces in the grow room.
There are a bunch of threads bout autos on here - use the search button, its your best friend.
also check out my profile, theres a bunch of links to threads on there bout autos and growing tech.