I recently sold mine, complete with M-mount. It simply wasn't getting any use any more. Looking through my photo archives, many of my favourite photos came from this and the 28mm & 50mm macro modules.
It's funny you ask. Yes. Just because of the M mount. My go to camera was always the GX100, but its now the GXR with M mount just to plug all the other lenses on.
Would love to see Ricoh continue the GXR. But I feel at some stage I'm going to have to go Pentax full frame. Just to keep playing with all my lenses.
Having started screening my Flickr images on a Samsung Art screen I've realised that so many of my best images turn out to have been taken on my GXR M mount with he Voigtlander 35mm 1.4, so I've just charged up the GXR to dust it off and head out. I'm also going to see if I can emulate in camera on my Sony, with the Voightlander, the look of the M Mount files. Anyone know how?
I like my Ricoh GXR and use it, with the m-mount module. (I have two, I bought a second when a local seller sold me one at a low price a few years ago). Here with a 40mm voigtlander heliar and leather case from leicatime. 12Mpix is enough for me, and sharpness is perfect...
I still have my two GXR with m-modules. When my A50 broke I missed it a lot especially optical quality. Only con was slow AF. Then I saw used Fuji XF 35/2 WR, I loved the form reminding me leica ones. Got an X-E2 and voila a fast AF for those occasions. Still when I see b/w results from Ricoh and a grain at 3200 ISO reminding me of film, I must admit that GXR has a soul. Of course m-modul sensor was designed with off set microlenses to counter vigneting. I can use my old Voight Heliar 15/4,5 with no color vigneting while on Fuji it`s useless. There`s a trend using old digital cameras having their unique qualities not measured in Mpx or high ISO and certainly Ricoh GXR belongs to them.