BIOS Magazine posted a review on the Mio C510E GPS receiver

With a compact and robust design, SiRFstar III GPS receiver, 400MHz processor, touchscreen destination entry, full 7-digit postcode entry, and Outlook calendar and contacts synchronisation, the C510E ticks all the right boxes. The 3.5-inch colour screen is nice and bright too, and the colourful graphics are welcome eye candy. Unfortunately, like most Mio products, the C510E is a nightmare to use and will bamboozle even the most patient and technical users. In particular you're never sure what button to press, and skipping back and forth between incorrect details often results in disaster and having to start the whole data-entry process again - or maybe it's just us!

Mio C510E Review