Although, Opera is way better than Internet Explorer but its still not fast enough. It is may be good for mobile phone but when it comes to using Opera browser in PC you will face lots of issue. The biggest problem with Opera browser is download speed as its extremely slow.
Moreover, downloading also get automatically canceled. It also some the plug-in issues as well. I am not sure if it is safe for Internet browsing because last month while using Opera browser on my Windows 8 pc my system gets infected by severe malware and I have no chance but to format my PC. After then I never tried Opera again.