If you're sitting on the fence on this phone due to size only, I recommend heading down to a place that sells the Infuse 4G (AT&T) and handling it. Aside from squared corners, the physical dimensions are similar. For me, even without a case, it was just too damn big. Phones like the Nexus S, Incredible 2, and Moto Atrix are pretty much perfect for me, but this is a matter of personal preference that will differ from person to person. If you plan to buy this phone before handling it, I highly recommend that you lay hands on the Infuse first.
I ended up getting the international SGS2, which is larger than my preferred phone, but was the perfect compromise of form, specs, and desired traits. And, for what it's worth, in terms of height, the RAZR, Rezound, and Nexus are all close enough to be considered similar. Also, the soft buttons take up enough space that the screen really is close to 4.3", making it so that these phones all look similar in size and screen size (except when playing movies, where the Nexus will shine).