I used SoftRaid before it was purchased by OWC. At that time it was just a front end to Apple's raid according to the original developer. I would guess that is still accurate.
As a developer I know that Apple makes it hard to keep software working as each new release has tons of bugs and API changes. Apple does a very poor job of protecting the operation of old code. Here, old code, means last year's.
The problem with the current SoftRaid subscription model, is that OWC cannot expect a maintenance product like SoftRaid to make the company profitable. I moved away from RAID in all forms because it is too complicated and too easily fails for small setups. By small I mean 3 or 4 drives. In addition, I have had terrible problems with Time Machine backups on virtual images. Time Machine just does not work for this type of data and therefore I don't trust it for any data.
My solution is to use a reliable backup utility and backup to multiple drives, in multiple enclosures, at different times. Storage costs have gotten low enough that, outside of data center needs, RAID is not needed.