What sets VSL#3 apart from most of the others is that they actually did some studies with j-pouches, and that is a rare thing. But, even with that, I would not say that it is conclusively superior to any other probiotic. What the few, small studes showed was that if you take it after surgery, it delayed the first instance of pouchitis.
http://www.ncbi.nlm.nih.gov/pubmed/16903771If taken after treatment for pouchitis with antibiotics, it prolonged the period of remission for a small number of patients. It did not appear to be particularly effective for treating active inflammation.
http://www.ncbi.nlm.nih.gov/pubmed/16197493The problem with the VSL#3 studies is that they are not very large or long term. Also, another important thing is that there are no comparative studies, pitting it against other probiotics. You really do not know if other probiotics might be similarly useful. So, again, this is one of those things that maybe it will be useful for you, maybe not. Apparently, the evidence is not strong enough for all the doctors and insurance companies to jump on the bandwagon and support the cost of treatment.
Jan