A pro of the SBI program on steemit is it both a great motivator to continue to create quality content. It also helps foster the mindset of helping others as you must nominate someone to also get a share.

A potential con of SBI, is you no longer control your STEEM you sent over. If you build SBI shares of 100-200-500 or more you have no recourse of SBI stops upvoting and powers down. I think its smart to slowly build your SBI shares and allow the shares to reach full payback.)