I cant complain, I only have 4 antminer s3 mining solo when they are not being rented..My best share was 2 months ago at 33 billion. Which that amazed me, since ive rented many many TH and havent come close to that...lol...
A guy solved a block solo a few months ago with an S3 when difficulty was 51G. My S3+ is still solo lottery ticket scratching, my best ever is only 1.9G.

I have a U3 sitting on my desk that hit a 33 billion share the other day. I took a screen shot before I had to reboot the laptop.
http://imgur.com/lFmFqI2Holy cow, that's downright amazing!