I have recently got an Olivetti 44, and got a bit puzzled by how similar its features are compared to a previous Lettera 22 I owned. Except for the size, of course, every other feature - tabs and margins, ribbon color, margin override, typing spring tension selector - is quite similar, at least as far as I remember them.

I have seen some posts and photo galleries where the three Nizzoli-designed models are put side by side, much as being part of the same family.

I have also read many posts where typewriter aficionados always stress the limitations of portables when compared to standard machines.

I consider myself a fast typer (although with a relatively high error rate, so far), and I found the Studio 44 action a bit stiff, although I also remember the L22 action was not featherweight, either.

So my questions are:

 - [broadly] what are the main differences between the Lexikon 80 and the others? What would make somebody consider the smaller ones as "unsuitable", and prefer a so much larger machine?
 - [specifically] regarding typing action and speed, are the Lexikons 80 typically different than the smaller ones somehow?

I appreciate your opinions regarding the answers as well as any other interesting fact you would like to share about this family of Olivetti machines .