I'm not happy about it, but it came down to Opera just no longer seemed to be working. I don't know if there was a new update or something, but Opera became utterly unusable on my machine. I openly and freely admit my computer isn't any spring-chicken but the lags to the point of unusability pushed me over the edge; at it seemed to happen over night. Pages, Flash and otherwise, just took ages and ages to load and when loaded were virtually unnavigable.
I've used Opera for years, probably for close to 10 years, and it's always been a great browser but since going to a Chrome platform it seemed to become more and more problem-prone.
I hope the lags I've been experiencing are due to some other issue that'll be worked out in a future update or something but, as it is, I just cannot use Opera.
The browser I'm using now works fine with no lags or slowdowns.