This list is over 2 years old now. Just curious, but do these apps handle Core Storage. Better yet, do any of them do a better job doing stuff like resizing, partitioning, formatting, or creating Core Storage systems. To my surprise the regular user version of Disk Utility seems to be a little lacking when it comes to dealing with these volumes.
Scannerz can test core storage units, both standalone and Fusion, and I assume that Drive Genius and TechTool Pro can do likewise. Scannerz can break a Fusion down into components and allow you to test each one individually, and I don't know if TechTool Pro or Drive Genius have that capability, but I assume they do. I'm talking about doing surface scan tests. Scannerz can also do interface and system tests, FWIW.
Regarding managing Core Storage, it's proving to be a problem for a lot of people using Yosemite. On some systems, if Yosemite is installed it will create a single volume Core Storage partition on the drive, and once that's done you can't do stuff like resize a partition or split an existing partition unless it's done using the command line version of Disk Utility (named diskutil.) IMHO a lot of Mac users aren't even aware of the Terminal.app utility, much less doing stuff using a command line interface.
I don't think any of the utilities I've listed provide management for Core Storage, probably because the developers assumed Apple would do it. Core Storage was introduced in Lion, and yet Apple still hasn't provided the necessary updates to the regular version of Disk Utility to handle it. I've heard that if it detects both an SSD and an HDD in a single system it will try and make it a Fusion combo, but that's unconfirmed by me.
Maybe someone out there has done such a utility. You might want to try a website like MacUpdate.com because they have all kinds of programs on there that often do what others won't. If you find such a tool, or anyone reading this sees or knows about one, let me know and I'll add it to the list, provided they're doing it legally and not taking advantage of someone else's work (as in hiding open source code behind an interface.)