Question: Tinker Tool to change system font

Hello.

I'm debating between buying a Macbook Air or a Retina Macbook Pro.

I like more MBA but what's stop me in buying it is that I fell Mac system fonts are too small for me at 1440x900 on a 13" display while 1280x800 on the same display are just ok.

I know I can adjust for dock, icons and icons name and obviously safari and other applications allow me to adjust the zoom.

But Mac, I found, does not allow to change system DPI as in windows so system fonts cannot be adjusted easily. What I mean is, for example, the title bar, system menu and application menu like:



I found that an application, Tinker Tool, allows to change this setting.

So here my question: does it work? This is for me really a discriminant in deciding what to buy.

Moreover reading in tinker tool notes I found that

Does the other program performs what I need? Any suggestion? I really like the Air form factor but before buying it I must be sure I will be able to work around this problem

 

EDIT: this is what I mean. Does it work?




I answer by myself. It works only in Snow Leopard. This menu is no longer available starting from lion. Damn!
So back to the original question, Tinker Tool works for what I need?