To answer your questions.
I was taking quite a mix of probiotics for about
a month or so - and then I realized its a lot of effort and money. I dont know what effect if any the other pro-Bs had but they gave quite a variety of strains in the begining. So I stopped taking those and only took vsl#3 from then on.
It also doesnt matter what probiotic you take - what really matters is the strains and quantity which is the same in all vsl#3. The quantity is up to you but I think to have an effect you really must take a lot - like 500 billion which is 1 vsl#3 sachet. To put things in perspective, the over the counter probiotics are usually around 10 billion, so youd need 50 of those little pills