I wasn't using Photos until today because I didn't choose to import my iPhoto library when it installed, and then couldn't find an option to import it later.
Well, I just did: option-click while clicking the Photos icon, and it asks you to import an iPhotos library. Hallelujah! Now I can start playing with Photos.
Was just going to ask if it's normal to have both iPhoto and Photos? I seem to have both...