The problem with photo stream is that unless you delete all the extra photos on your phone, they atomically migrate to your other devices and to the cloud, taking up storage, and in the case of my computer, slowing it down. I'm pretty sure my last computer lost it's umph and had to be replaced prematurely because I never adequately managed my photos.
That won't be happening again. Here is something I learned in my hours of "photo management"....
When you delete photos in iphoto, they DO NOT go to your computer's main "trash". Instead, you must empty your iPhoto trash.
Here's how to do it!