The "doorstop" model. It doesn't fold, making it incredibly durable and perfect for younger children or those who find the clamshell hinge too flimsy. The Software Elephant in the Room

This is the "sleeper hit." It has all the power of the "New" models but lacks the 3D feature. It’s lighter and features a sleek, modern clamshell design.

When shopping on the second-hand market (eBay, Mercari, or local shops), check for:

Some "New" models come with IPS screens instead of standard TN screens. IPS displays have better color saturation and viewing angles, making them highly sought after by collectors.