I've been having sacro-iliac pain on and off for weeks, but the last few days I've had SPD pain also... and I just couldnt take it anymore. I went in to the local maternity boutique and asked about belts. She asked where my pain was, I told her, she put one on me. I immediately said "how much is it, because I am not taking it off."
It feels so much better. I definitely still feel some back discomfort (it stretches it out over more area, but its very mild) but the pubic pain is gone with it and I dont feel like my pelvis is about to collapse if I walk or try to, I don't know, stand up or something really strenuous.
I did take it off for awhile this afternoon while just sitting here, thinking that maybe its not so good to wear it ALL the time, but getting up to go to the bathroom without it made me realize how much it helps all over again. Can you wear it too much? I do want to sleep in it, because rolling over in bed is excrutiating with the SPD...
I am kicking myself now that I didnt get it 2 months ago when the back pain started really getting bad on and off! I can highly recommend it.