I'll chime in here since no one has so far.
1] The Fostex brand, which I do not prefer, but understand they are OK for their price point.
2] Three channel recording devices, especially for audio only seem to me to be a bit "behind the times", especially with the Roland R44, Zoom H4 and H8, SD788, Tascam DR680 i.e. the many 4,6, and 8 channel recorders out there. (edit to point downthread to Gutbucket's comment on three mic configs being worthy of a try at least- and to further his point about the Fostex being 3 channels in but 2 record tracks)
3] I see they have an SLR mounted on top of the DC-R302 which implies they are selling this for use by videographers. Also implied, is that you would do a 2 channel audience audio with a single mono SBD channel as this is probably the method which meshes best doing SLR video for audio. Aside from the fact that most club or small venue SBD's probably don't reproduce stereo well, and that a mono SBD feed may not be a bad idea to enhance a 2 channel audio, I just don't see any serious audio recordist doing 2 channel SBD and one channel AUD.
4] On the positive side, $499.99 is a reasonable price for a 3 channel recording device. It does run on 4 AA's (6V) or AC power 9-24V so it is "standard in that regard and probably coukd be run in the field with a Tekkeon or similar battery source.
That's my $.02 coming from a new to me DR680 owner who is really starting to love and learn the 6 channel capacity of that device.