Photoshop vs Photoshop express

Hi,

I am looking at another software bundle, wich does not include Photoshop, but it does include Photoshop express.

From the description of Photoshop express it does not look like it is much different then normal PS, but i highly doubt it.

So my question to you guys is, what is the biggest disadvantage of PS expr. vs normal PS?

I dont really use all functions of regulair PS so it might not be the biggest problem, but that depends on what you guys have to tell me.

Thanks already!

-Nick