Jon Rettinger of TechnoBuffalo has published a video of himself explaining that he's switched from the iPhone to Windows Phone, and the HTC Titan is now his main handset. One of the main features he loves about the platform (and the device in this case) is the size of the live tiles and content on the massive 4.7" screen. Rettinger's main concern with making the switch (as is with every potential buyer) is the choice of apps on the Marketplace, but goes onto state that every app he required was actually present in the catalogue, or an equivalent available.
Overall he's impressed. What's more is that when Rettinger shows his Titan to other people when out and about, there's generally a positive response, but he notes that the biggest flaw of the system that could be turning away a lot of folk is the attached "Windows" brand. Let's not forget that Microsoft is in a reforming stage, if you will. Closing up, he has no regrets in switching and doesn't look back at the iPhone 4S. Take that Siri.
Source: TechnoBuffalo, thanks Theo for the tip!