Although I can't see how much of a difference it would make since these units just act as an extension of whatever ports they're hooked to on your motherboard, no?
Should really add some salt to others advice in the respect that these things are just a simple pass through device and couldn't possibly have issues.
If you do some additional research.. you will see all sorts of issues with folks having detection/dropped drive/raid issues when attaching sata3 SSD's to sata2 backplanes/hotswap bays. For very fast sata3 SSD's it would be like adding too long of a cable in many situations and can lead to signaling issues. In fact.. try running a SF-2281 controlled drive that is capable of fully saturating the sata channel and see what happens(many others already learned the hard way. Heck.. even a weaker sata3 cable can cause similar issues for some.. so it's not far fetched to imagine what problems a cheaper setup like that original choice could have.
Point above was intended to forewarn you of the potential pitfalls relating the faster SSD's running off hotswap/backplanes. If you are thinking of upgrading to faster SSD's down the road and could possibly want that bay to be usefull and not add issue?.. maybe spend the money now and go sata3.
If you don't want to spend the cash for higher quality sata3 stuff right now?.. just do what was already rec'd above and go with a simple multiple 2.5 inch drive mounting bay to run direct cabling to the SSD. Then revisit the option later on(there will surely be more available and prices will be even lower due to sata3 SSD market saturation) and toss the cheap one you got earlier into another system.
Faster tech just needs better supporting hardware and cabling(this sure ain't HDD speed anymore, right?). Sure, some may get lucky with the cheap stuff.. but it's really just cheap insurance and often the best bang for the buck in the long run to spend more for quality up front.:thumbsup: