Hmmm, I like this feat, but once again, as has been expressed, Combat Reflexes is kind of dead in this.
My suggestion would be to coordinate it with a different feat that I've found to be useful in getting between that sword-blow and your squishy spellcaster.
The Feats are:
Constant Guardian
Dutiful Guardian
These feats come from Drow of the Underdark.
If you use these feats, it would make sense to me. You deliberately get in your opponents way and keep them locked onto you constantly with this tactical feat.
Thoughts? I'd like to use this feat for my Warforged Fighter that was built as a (nearly) pure tank.