The new dolphin hd beta with dolphin engine is pretty damn fast, but I found it a little unstable. I'm using the standard dolphin after doing the rounds with pretty much everything else out there. I liked opera, it used to be necessary, but with dual core hardware and the acres of RAM the atrix has, I don't think there is any need for light browsers anymore.
I just have one big issue with dolphin in that they fill your add on bar with spam add ons. I have no desire for dolphins battery saver add on yet the only way to get it out of the way is to install it and disable it. I am not impressed, dolphin is seriously a good browser though, I always seem to come back to it.
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Motorola Atrix 4g
Advent Vega - vegaICS beta 1
Retired: Xperia X10i, oodiemiui prime x - 1.2gHz