Hello, I have a 15" MacBook Pro which I have heavily upgraded. I got a base model i7, matte screen Macbook for a christmas present, I then progressed to add more ram which I moved up from 2 to 4GB. That sped up my system well, I then progressed to remove the superdrive and replace it with a SSD, which I then loaded Photo Mechanic, Lightroom and Photoshop aswell as OSX. Has not slowed down one bit and my last MacBook lasted about 7 years if I remember correctly.
Works pretty well for me; hope it helps.