I bought a couple of microphones looking to replace my Plantronics .Audio desktop microphone. Of them were the Koss M-18, Logitech USB Desktop, and this one.
This Olympus was the cheapest of the 3. It's sensitivity is a little low. This helps with canceling a lot of background noise & makes sense as the primary purpose of this mic was usage with digital recorders. However, any dictation where the source is further than 10 inches may not record clearly.
I was using the mic with my PC audio card so results may vary when using it with the suggested Olympus recorders.