The 2-day verdict on the iPhone 4

Upgrading from the iPhone 3G, as I did on Saturday, it is immediately obvious that the iPhone 4 has two standout features. Firstly, the new display is absolutely stunning. Whatever you might think of Jobs' marketing or the argument about the Retina Display, there's no denying the fact that it is an exceptionally good screen, looking for all the world like an illuminated, if shrunken, page from a glossy magazine; it really is that good.

Secondly, iPhone 4 is quick. Very quick. Really fantastically quick. All the little niggles you might have had about apps opening slowly or updates taking a while or the keyboard occasionally being unresponsive (all of which were regular, if minor, issues on my 3G) have been smoothed away by the improvements in iOS4 and the brutal speed of the A4 processor.

There are a ton of other improvements, of course, but if you're looking for reasons to upgrade, those are the biggies; the rest (better camera, FaceTime, industrial design etc.) are nice to have and make iPhone 4 a hugely capable product, but in comparison they are just the icing on the cake.

Conclusion; upgrade as soon as you can.