Nice review The main point I like with this drive is the ease of use - Just install it in the PC, install the software and reboot. This is certainly a lot easier than installing a dedicated SSD with typical user installations where they must move off most of excess data to be able to reduce the OS partition to fit on their new SSD, not to mention having to run a cloning process.
NVELO is actually working on secondary HDD support, but at the moment it is still in beta, based on me recently contacting them. Hopefully once they have a stable release, it will be available to existing Crucial Adrenaline customers.
It would also be nice if NVELO made Dataplex available as a standalone software package, where users can choose their own SSD. For example, for users who upgraded their 32GB/64GB SSD to a larger model, that small SSD would be perfect as a cache SSD. One drawback is that many early SSDs do not perform well when filled to 100% of their user-capacity, as the caching software makes full use of the user-capacity for caching from what I'm aware of.