Besides the display, what is the difference between the MZ-RH10 and the Mz-RH910? It makes me nervous not to see a clear mention of the capability to record in linear PCM.....Are the any hidden tricks (Sony....). In contrast, the sony MZ-M10 advertises that feature right on the case itself... I do nature recording in less than ideal settings and the display seems irreleant. I am more concern with the sturdiness of the unit (specially the mic input) and the recording time with the extra battery pack. Any advice will be wellcome.