Back in 2010, I bought a used 2008 Penryn Black Macbook as an upgrade from an old Mac Mini that i'd just sold. I didn't want to splurge on a new MBP because I was waiting for the MBP to be redesigned (which ended up being the 2012 Retina MBP) so I thought this computer would suit me fine. Well it survived being in Okinawa, Japan and a deployment to Afghanistan and back while still kicking. When I got back to the States, I decided to buy a ridiculous HP laptop to play a Star Wars MMO that no one plays now. It was the worst decision ever. Eventually I left the Marines and moved to CA to be with my boyfriend (now husband.) I'm in school while he finishes up his degree. Money is a little tight, so instead of splurging on the $2500 Retina MBP I want, I decided to dust off my old Macbook and refurbish it. I decided to upgrade to an SSD drive, take out the optical drive, and put the old HD in an enclosure and put it in it's place. I also redid the thermal paste for the CPU.
I was a bit frustrated at first because the enclosure I got from Amazon ended up not having the PATA connector, which meant that it was useless. I blasted the seller and the product on Amazon, returned it, and got this one instead. It's amazing. It fit right the slot and works perfectly. I would say that the hardest parts were removing and replacing the screw that holds the optical drive in place and not ripping the black tape when pulling it off the old bay and putting it on the new one. I ripped it, but luckily it went back on just fine.
Always check things like connectors when replacing drives. I got 3/4 the way through my repair the first time before realizing that the enclosure I bought wouldn't work.