There is nothing wrong with Rowa. It is a great product but it does require a reactor to be used efficiently. To me the big difference between GFO products and products like Phosguard is how they are used. Phosguard is best used in a bag in a sump, used in a passive way and contrary to what has been said it does not leach Phosphate....again from Seachem's site...
"It does not leach phosphate or silicate back into the water and may be removed, dried, and returned to service until exhausted. Continuous use of small quantities is better than intermittent use of larger quantities."
My concern with Phosguard was the small amounts aluminum oxide leached into the water. (As per Randy Holmes test) It is inconclusive as to how bad this may or may not be, but as a beginner I didn't want any more unknowns. This added with the limited soak time and inability to use it in a reactor made it a poor choice for me.
I still have the almost full container here, I've kept it for emergency use or if someone local wanted to use it up.
Seachem is a reputable company, phosguard has been around for a long time, so while it probably isn't terrible it's just not ideal for me.