Google expects to initially order 600,000 units from Asus and for the year that figure should be 2 million to 2.5 million tablets. The competition is the Amazon Kindle Fire and if all of those rumors prove prescient, the mini-version of the Apple iPad. The latter is supposed to offer a 7.85 inch screen while the former has a 7 inch display.
Thus far, the Google Asus Nexus 7 tablet is number 11 on the Benchmark results list with a score of 18. The top tablet, with a score of 32, is the Samsung GALAXY Tab 7.0 Plus, GT-P6200. It looks like May 14th was the first date that the Google Asus Nexus 7 showed up on the Benchmark site and has been tested every day since. Don't be out off by the lackluster benchmark score. First of all, this is a device that is going to compete on price. Furthermore, there still could be some tweaks necessary before the device launches.
source: Rightware, AndroidPolice via AndroidCentral