According to TipRanks - Olivers success rate is 44% and average return on buy recommendation is -6.88%.
meaning that if you would have listened to him these were your statistics....
Be careful who you listen too..
Good news is he only started coverage on sep 13 2012. I am not relying on him. That GS conviction buy rating made sense
BTW - i highly recommend you use TipRanks they launched a closed group alpha. and they are scanning the internet showing individual investors how good are experts you come across in financial websites.
you can use my download code: TRUG
let me know how that worked for you.