Good products, but my Macbook Pro 6,1 was different from the guide
I ran out of space on my main SSD, so I got a second one for the optibay.
It's a nerve-wracking 20-30 minutes with some tiny connectors, but the iFixit tools and enclosure are excellent. The review, however, had pictures of pretty different Macbook Pro, so I had to go to Youtube to view a movie from OWC. Also, while it's simple, it took me a while to figure out how much force I needed to put on the SSD to snap it in place in the enclosure. It's a lot. If it's lined up, then go for the gusto.
The reviews I read suggested that the Samsung 830 is the most reliable drive these days (and is what Apple installs). It's a bit more expensive than Crucial, but the Newegg Crucial reviews are not that good.