I really enjoy this synth. It is easy to program and sounds great. UI:Please note that the newest GUI is completely redesigned and looks great. Simple, clear, catchy. Doesn't hog the screen. Plus, I like sliders much more than knobs. Sound:Wow. It just sounds great. Very thick sounds possible. Despite the name, this is not a 303 clone only. It is very flexible and capable of a wide range of basses, leads, and maybe even a pad for a creative type. The filters seem nice, as well. Documentaion: Straightforward pics of synth with midi labels. No tutorials, but its awfully simple. Presets:decent variety Customer support: I have no idea, never having contacted them, but they do have an active forum on the site, primarily in Japanese. Value for money: It is a great time to live in when synths that sound like this are free... Stability: This leaves a bit to be desired. Occasionally, loading user presets hangs the machine, or loading a preset and then cycling through the OEM presets, the user preset vanishes and/or resets to the original. Still very usable though.