if I may offer a less techincal opnion.....
Ironically. I am as of now, working through a bag of Roma, and have a bag of Foca up next. I have used Roma before. Now let me paint a little bit of backround for contexts. I am a singe person, 1 or two loads a week, and some extras depending, in a top loading, automatic Maytag. I also don't have alot of money, and for me Family Dollar is 3 blocks away from me.
So with all that being said, I don't seem to visibly have problem with Roma, I personally don't see any buildup, or issues with getting clothes clean. I also notice a light pleasant sent too! I know that is a very simplistic way to look at it, but all things considered is that not what is most important, the end result? No disrespect meant to the science and good points made to the chemical aspects.
Also, I am on a fixed income so budget is also a factor for someone like my self. I will admit, if I can swing it, I will occasionally treat my self to a box of tide or Cheer (I am a strong powder guy here!), if I can swing it, but here locally to me, a box of Tide is almost $15, and a box of Cheer is almost $10, and even Surf, which I also like is between $7 and $8 roughly. So with that being said, and with the fact that laundry detergent is a basic need for personal hygiene, Some times a small bag of Roma is what is needed.
So just another thought from an Average HouseBear!=)