I will try to make this clear for everyone, for once and for all.
An ssd caddy is just a piece of metal with a sata connector.
Essentially what you are buying is a bridge between your ssd and the actual ssd port on the motherboard.
Sata cables (in this day and age) do not differ in link speeds, thus your caddy won't either.
The point of this thread was to show people that companies such as MCE and what have you, provide you with the same caddy a chinese ebay seller will.
There are some differences in caddies, but those are mostly stripdowns or alternative 'holders' (e.g. the DataDoubler).
Have you ever noticed that all the ebay models, all the MCE models, all the other 'branded' models look exactly the same?
Well, they put on a different sticker perhaps, but in the end you get my point.
Then why does it cost 10$ on ebay whereas it will cost you 6-7x as much on MCE?
The answer is simple, good marketing strategy.
MCE knows that more and more people are starting to swap out their optical drive. Combine this with the uniform hardware that every macbook pro user has and it's quite obvious what you end up with.
MCE has created the idea that you deserve a better quality caddy for your superior macbook pro.
All those rumors you have heard about crappy ssd's and all that may be true, but most of the time it's the user's fault for buying the wrong caddy, as there are still differences in PATA and SATA connectors.
If you have any questions, please do ask them
- Chris