This product is amazing. Given the amazing pedigree of their past recorders, Sony has made the obvious next step in their recording line by offering a solid state high-res digital recorder. I recently completed a soundwalk project in Shanghai, China where I hand-held the recorder using the optional stand and it performes beautifully, given its age and how much I have used it over the years in many different locations with varied climates. My unit is 4 years old.
I use it as my main recorder in my work which is documentary, film, foley, and creative projects. The sound, quality, and features are very competitive and are in harmony with each other rather than just having the smallest box with the most features. The user interface is very basic, intuitive, and foolproof. The battery lasts amazingly for way over 8 hours (these are for rechargable- it lasts even longer when using disposable batteries) and the built-in memory is perfect for those long 8+ hour overnight recordings. Add more memory for double the time and swap them out for continuous recording. This machine is very reliable in the field and is one recorder that one should never be without.
My only complaint is that the buttons and screen are on the front of the machine making it hard to use with an external mic. I do sound recordings for documentaries and films and I need to use this with a Sound Devices 302 mixer in order to control levels easily. I also wish I had the double knob control like in the D1. But otherwise, this machine is great. The phono plugs might be a but 'unprofessional' but the high-quality connectors ensure the best connection between the unit and your cable.
Would I buy it again? Yes! But I don't really know why I would need to. Know that if you do buy this machine, you are in store for a long and happy relationship.