I have been eyeing an SSD for quite some time, and finally decided to pull the trigger after a good friend of mine purchased one for his MBP. I wanted to continue the use of my old HDD, so this bundle with the Disk Doubler was the perfect solution.
The performance of the SSD is truly unbelievable; I really had no idea how fast my MBP would run but it boots up in about 5-7 seconds and all my programs launch almost instantly. If you can afford the drive, do not hesitate - just buy it you'll be extremely happy.
The Disk Doubler is impressive - very sturdy and solid feeling and it fits perfectly where my optical drive used to live. All the screws line up perfectly and my old HDD fits nice and snugly in the mounting brackets. I have to admit that it actually looks nice, too. To bad there is no clear panel to put on the back.
Installation was quite simple. I've been building computers and working in hardware for quite some time, so it made it easier, but I think as long as you are patient and follow the instructions, it is easy to do. I would recommend watching the video rather than following the instruction booklet. While the booklet is comprehensive, there were some discrepancies between the layout of my mid-2012 MBP and the instructions in the booklet. The video matched my layout. Also, the video recommended to place the SSD in the position of the original HDD rather than in the position of the optical drive to alleviate possible issues - a point not mentioned in the booklet.