With pre-ordered iPhone 4s arriving early and the big tech pundits having received their models a week in advance, the first reviews and benchmarks for iPhone 4 have begun appearing online.

As you would expect, the usual suspects such as Walt Mossberg, David Pogue and Ed Baig all think Apple’s new phone is the best thing thing since… the iPhone 3GS, and even the tech sites are joining the love in with both Josh Topolsky of Engadget and Xeni Jardin of Boing Boing scoring the device highly.

Mac Rumors has attempted some benchmarking of the iPhone already but has pointed out that its finding aren’t an exact science. Using the GeekBench benchmarking tool on iPhone, however, it appears that the iPhone 4 runs around 31% faster than the iPhone 3GS but likely slower than the iPad which runs the same Apple A4 processor as the iPhone 4. These results are clouded by the lack of iOS4 on the iPad and fuzzy results from the benchmarking tools which are said to have produced a large variance in scores.

Other notable discoveries include the lack of a capacity marking on the back of the new iPhone whereas previous models showed 8GB and 16GB on the rear panel and 512MB of RAM available. For those who really want to delve into the nuts and bolts of the iPhone 4, iFixit has begun its teardown of the new phone and it has been suggested that the screen on the new device comes from a company called Corning who offer durable screens called Gorilla Glass.

Of course, we’ll bring you all of the latest iPhone 4 news as we get it and also provide our thoughts on Apple’s latest device as soon as possible.