I love the combination if reach and combat reflexes. I have 2 summoners, 4 Eidolons(from 4 summoners total) and 2 multiclass Alchemists who all use this combo. None the less, I think most proponents of such describe it as way more effective than it actually is.
I think most proponents way over estimate how many AoO they really get or have fools/careless/deadicated GMs.
I disagree with power attack on a 3/4 bab class. Extra damage equals nothing when you do not hit at all. If you love to gamble, it works well for those players as long as they are humble enough to understand they have no one but them selves to blame when they miss on a roll of 10.
I think Magda finds herself in a really unusual game environment where she can often spend multiple rounds buffing before combat. How many encounters a day do you gothrough? You are buring many resources per fight.
How long does it take for the payers to complain they are tired of plaing by your tactics? Players only have so much dicilpline to play smart, sounds terrible but it is true.
So many combats put archers / spellcaters in points where you need to get to them, your reach does nothing for those conflicts.
Avoid dropping str below 18. As a 3/4 bab, and your choice to power attack, you need that extra +1 to hit. Highly consider weapon focus to further enhance your chance to at least hit so you can do any damage at all.