I purchased the VX401 online based on Clarion's reputation and the specifications. I was not mislead by any means, just completely unimpressed with the user interface. It is anything but intuitive and it seems they have gone out of their way to make it difficult for everyday adjustments. I'm not taking about crossover settings, I'm taking about tuning the AM/FM radio. You can't just punch in a station on the keypad or quickly advance up or down the dial with the click of a button. You must use seek, scan or click one station at a time. The USB interface is completely frustrating. The front auxillery input only outputs sound to the rear channels by design. The remote is laughable and anything but 'full function'. The tuner is adequate.
The DVD playback is as good as can be expected from an in-dash. Sound quality is acceptable. I've been using this deck in my work truck for 4 months and I'm thinking of upgrading out of pure frustration.