With Mavericks
For tasks such as defragmenting the startup volume, for me the current beta of iDefrag does not work. That's not a complaint (it's beta software); just an observation.
With Yosemite
In what way is it more robust?
Do your products work on Yosemite (Mac OS X 10.10)? Coriolis Systems Limited
For me, using beta 4, it works defragmenting any drive including the boot drive
Its more robust in that:
1. It works without screwing up my drives. See posts on other threads about Time Machine trashing backups such as:
a) Gets calculations completely wrong on the TM execution following a run when a source drive was dismounted
b) If a large file copy is in progress when TM runs, TM only backs up portion of that file
2. I don't get dozens of log file messages about issues that should have been fixed before the software was released. One of many examples:
a) open System Preferences
b) click Accessibility
c) click the button with at the top with the grid of dots
d) look at the console log, result for me is a stream of repeated rubbish, 32 pairs of messages, one of each pair reading: "22/01/2015 07:24:09.363 com.apple.preference.universalaccess.remoteservice[573]: CGContextRestoreGState: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update."
e) Either its serious and should have been fixed or the message is meaningless and shouldn't appear.