Sound Devices is the holy grail of location audio. Really a different class altogether. I got interested in handheld portable recorders for documentary production in situations where a full professional rig would call too much attention or intimidate non-professional talent.
So far, the Edirol R-09 is the most inconspicuous dedicated recorder I have used.
The Zoom H4 sounds nice, but the controls and build quality are terrible. I like the XLR inputs.
The Zoom H4n is supposed to correct most problems with the original. It is featured on the Zacuto website as part of their DSLR video product offering.
The iPhone with iProRecorder is actually the most inconspicuous of all.
I've never seen a Tascam DR-100, but I've been told it is built like a tank. Plus the reviews say the control layout is simple, and the display is large. It can be operated without constantly going into software menus. It has XLR inputs. Basically, this sounds like perfection of the Zoom H4 concept. I bought one on a one day special for $299 through
Sound Professionals. B&H now lists them for $329.
The Tascam DR-07 is an attractive, well built recorder that would be of interest to podcasters. It is small, but still a bit large. Recently, Sound Professionals offered a one day special on the DR-07 for $99 -- a stunning low price.
Yamaha makes some interesting recorders in their Pocketrak line. I live in the outback of Texas, so I have to buy this stuff to see it. Due to size, the Yamaha might be ideal for ultimate stealth.