I have benefited quite a bit from a modified version of the SCD over the years. By benefited I mean that it has reduced my symptoms quite a bit... I learned this quickly by experimenting going on and off the allowed foods in the first year. And by modified I mean a lower-carb version, as I seem to flare on the higher carb items that are "legal" on the SCD such as honey, fruit, nut flours and nut butters. I also have to be very careful not to over-indulge on the SCD yogurt, which is tough because I love the stuff.
If you want to "test" out the diet, I'd suggest being very strict for a few weeks and if you can manage it, don't even try sampling the higher carb legal items for those first weeks. Granted that might make it seem too deprived, so if you just have to try them, I'd say stick it out without them for at least a week and then only try them out one at a time and only in very controlled quantities. I always got the impression that those who say the SCD made them worse are those who immediately went whole hog for the SCD-legal sweet treats and were thus taking in massive quanitities of sugars.
Like princesa says, the SCD can be a very balanced diet, and it pretty much eliminates all processed food, so it is quite healthy for general nutrition, in my vieww.
Pancolitis dx'd 1986, full med-free remission 88-97