This isn't a substitute for SSD.
Ask them to do a video of them opening EVERYTHING on their dock while simultaneously copying a file to an external drive.
It's a good upgrade for the price, but not revolutionary or anything more than a minor speed bump for the very few people who only access the same 1% of their drive most of the time.
+1 , I hope everyone understands this too. But let me explain how I made my decision...
I don't think most of us will ever open everything in the dock at the same time and transfer huge files (and capture video and listen to music and watch a movie and do a Time Machine backup) all at the same time... Well, I may be wrong. I think most people open the same few apps very often and use some other apps less frequently.
I consider myself a power-user. Most of time time, I'm either working on my Mac (web design stuff) or playing with it, I consider this computer to be my life. If I don't have it, I'm not making money (and I'm not having fun). But I also know that most people who are like me will find this drive to be good enough for their needs.
I had a 60 GB SSD drive in my computer for a few months and yes, it was really fast. It was also tiny, I always felt cramped and I had to plug my stock 160 GB hard drive via USB anytime I wanted to open iTunes or work in Photoshop. This drive is 500 GB and makes opening the apps I use really really fast. If I can open and close Photoshop, Dreamweaver, iTunes and Firefox quickly, I'm happy. The rest of the system becomes really fast as well, but of course that's because it's a 7200 RPM drive, compared to a 5400 RPM. I don't work with big files so file transfer speeds don't matter too much to me.
It was either this for about 170$ (canadian total with taxes and shipping) or buying an Optibay for 199$ (for 500 GB 7200 RPM, because my stock drive is 5400 and that's slow) or 99$ (with my slow stock drive) and having to install it myself, risk screwing something up, voiding the warranty, making the computer hotter and noisier AND losing the SuperDrive (which I use quite often) etc. This was just cheaper and easier... and it seems to work really well according to the reviews I read.
I agree it could have been cheaper for what it is, though. As soon as I can get a good 320+ GB SSD drive for under 200$, I'll consider one for sure.
I don't know, maybe I'm completely wrong about this, but I wouldn't pay hundreds and hundreds of dollars for a good tiny SSD and start replacing stuff in the computer or use an external drive all day long (making the computer slower). I want my portable computer to be portable. I'm already annoyed when I have to plug it into a wall, honestly. I'm just trying to make it even faster than it normally is. And I think that's what most of us want.