Yes I bought it off a reseller and explained that I wanted to be able to buy the SSD's and use the super raid option to raid them with the HDD separate. They never said I needed to purchase anything other than the laptop and the drives - are you saying I need to purchase some other connector/controller?
The Super RAID is two mSATA drives on a dongle that is in the primary drive bay, the other drive sits in the other bay. The Intel controller sees both mSATA drives as two separate drives and lets you RAID them together.
Here is what they look like
If you don't have the dongle you will need to contact support and they will sell you the part you need, but you will have to buy the mSATA drives too if it didn't come with them, unless MSI can sell you those too.