A couple of minutes back, I downloaded Opera 9.50 and installed on Hardy Heron. The installation was a snap. The new default theme is cool and does not interfere with what you are doing. Opera is touted as the most fastest powerful browser and complies with various web standards completely
This is not a complete review, the only meaningful measurement I was able to take was the memory consumption with three tabs having Twitter time line, WordPress write post page, Gmail open. The memory consumption stood at 59.3 MB. Where as Firfox 3 RC 2 took up 83.2 MB for the same sites open in the same order.
Here is screen shot. Click for a larger picture.