Should I buy an Ereader?

Hi there! I wondering if I should buy an ereader.
I don't have problems reading on screens (though I prefer physically holding books as I read). The thing is, my house isn't a library and I can't fit all my books in my room anymore (I even had to stuff them in my closet).
Can you give me facts that I need to know about ereaders? Cuz I plan on buying one.

And I've always been wondering, if you ever bought an eBook online and saved it in your ereader, what would happen if you accidentally deleted it? And what if you don't have any more memory space to fit All the books that you've downloaded? Will you delete it and end up wasting your money on buying it?

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