I have an SBI site too. I have mixed feelings about it. I've considered cancelling it and getting the remainder of my year's worth of money back, but the people on the forum tell me my site is amazing and has great potential so I kept it. I should be fair...the program is great and I can't complain at all about it's effectiveness. My site was getting up to almost 50 visitors a day in under 6 months. I'm not monetizing on there yet though so I haven't made any money yet. My only issue is with ME, my site is not successful because of me and I will admit that. I took on way too much and now I realize my goal can probably never be reached, so i've just lost all motivation to work on it and my daily visitor count has probably sunk below 20 a day, now.
I should add that there is one thing I don't like about it, but i'm not sure if it's just me being picky or what. But when you're creating a page, it is made up of blocks, and in each block you put a headline, picture, or text (and some other stuff too). but the problem I was having was it was just so time consuming to create a page. You have to click for the headline, type the headline in, click for the text, type the text in, click for the picture, find the picture on your computer, upload the picture, type a title for the picture, click ok, click for a link, click to preview, click to fix any errors (they tell you if something isnt good enough for the search engines) and then click to publish the page. The MINIMUM time it took me to finish ONE page was 3 HOURS. And after working on my site for about 7 months, I was still only about 1/4 of the way done. It was just too overwhelming and I lost all motivation to work on it and so now it's just sitting there and I'm not sure if I should renew my account when it runs out.
In case anyone is interested, here's my site:
http://www.music-that-rocks.com/