Steven J. Vaughan-Nichols over at ZDNet summed it up pretty neatly for me and revealed problems and vulnerabilities which I didn’t know about.
Quoting just the highlights (see the review for details):
Operating system incompatibilities: XP is ignored. Whether it’s a dinosaur or not, it’s one of MS’s OS’s and this, to me at least, just isn’t playing fair.
Performance: FF4 betas and Chrome outperform it on the majority of benchmarks. Heck, Opera 11 seems faster to me, also.
The 64-bit version of IE 9 is second-rate. It’s slower that the 32 bit version. What does MS say? “The majority uses x32.” Well, x64 folks matter less? Good to know.
Lack of Security: While more secure than ie8, it’s far from secure. See the review for details. Basically? The Tracking thing is spotty, and the way it handles plug-ins (the fave attack point of hackers) does not warn the way it should when using an outdated plug-in. That’s a major vulnerability.
Lack of Compatibility: So you use “Compatibility”. So, you’re using a prior form of rendering. So much for the hype.
That’s why I’m pretty disappointed. Also? It doesn’t look all that good, at least to me. So I’m sticking with Chrome and FF and Opera.