Thanks for finally coming to WP. 
I'd preferred Opera Mobile over Opera Mini, but hey, it's a start.
Unlike many others the app doesn't crash at all for me. It runs pretty fast and reliably.
I'll try and summarize what I think needs some refinement and improvement:
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page loading times. These are definitely slower than what I was used to from Opera Mini on Windows Mobile and Android.
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Adding a new search provider is too much of a hassle. This should be possible from the manage search providers page.
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Speaking of search providers. I definitely want to be able to change my default search engine. And I'd like to be able to remove Google from this list completely.
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Page rendering isn't too great yet. Some pages show the mobile view, some the desktop view. It should be up to the user to decide which view to choose as a setting. Works great for IE.
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there should be a setting to set the default downloaded folder, to not have to move each and every download from the isolated storage to an SD card or other publically accessible folder permanently.