I switched from the HTC Windows 7 to the HTC Windows 8X seamlessly. Apart from minimal changes to the formatting of the tiles, (so I could view my most important apps on screen without having to scroll down), the change process has been completely worry free - thanks to a particularly helpful Telstra dealer, and my partner who managed the data transfer for me.
I particularly love the freedom of using the Internet sharing feature of the Windows 8 phone with my new Surface 8 when I travel, eliminating the need for the additional modem device (and associated plan). Just love it! The phone is performing well in terms of ease of use making and receiving calls and texting etc., excellent clarity and volume controls. And yes - the bright colour does help me to locate the phone within the darkest confines of a crowded handbag!