How Secure & Reliable Cloud Computing

Hi..
my company just start to look new technology that can help us to solve IT problem

i hear what it call cloud computing, after i read some source i have a lot question about this technology

how far cloud computing is secure and reliable?? i am quite agree with Richard Stallman’s for his opinion that cloud computing less secure for sensitive company data to be host on internet

i am open to discuss

thank you

regard
Adi