There seems to at lot of issues regarding the new Opera 15 version. Im rreally not a man of great knowledge regarding browsers and so on. But with this upgrade u have removed the key things i loved about opera, apart from it not being Chrome. Now it seems to me to be a bad version of Chrome.
And first things first the 15 version seams faster and less crashing to me which is a +1 on the list.

I ask now:

1) Where is Ctrl+Z?
2) Why cant i adjust my seaching engines and the old ones i had from 12; fx to me "y something" means youtube seach on 'something', but now im forced to write "youtube.com 'space' something" to seach.... or i will end up on useless yahoo........
3) Why did u simplify and reduce the mouse dial function? It was something rly great about 12'
4) What help is help doing me? it seems there isnt even a seach bar.....
5) Why are there no "advanced settings"?
6) Why cant i customize my browser like in the old times?
7) Where is adblock? if i get a commercial screaming (like sounds of my system) "U HAVE WON!" why cant i block it?

In hope of improvement. If you fix this i may consider returning.

Regards
Someone who used Opera