Hi hurukuru,
Well, as I'm very much a fan of the all-in-one, the Portacapture X6 was almost was my next choice. However, after spending the past decade-plus using handhelds (for their built-in mics) my curiosity to finally explore the use of XLR mics had reached its tipping point.
I'd always resisted that path with the R-26 as it required too much gear for my field usage...DSLR-now-mirrorless camera with telephoto lens + microphone (for photos and short video clips of my targets), binoculars...adding the R-26 recorder in its case with strap-over-shoulder and having cables dangling about along with a pistol-gripped shock-mounted mic was too much gear to successfully manage whilst trekking through the brush! Something to be said for a quality recorder one can slip in and out of one's pockets and that now-lost R-05 was the best of the lot of pocket recorders for my needs!
My experiment with the F3 + BP4029 is to try and rig it all onto a single handgrip that I can somehow clip to my belt for easy access in the field (trust me, trying to manage three neck-strapped devices in the field is tempting the disaster fates! Ha!). I haven't figured the setup quite yet and it will be a bit of a project for me over the coming weeks, perhaps a, er, "fanny pack" of some sort?
Regarding the Portacapture series, a few other niggles kept me from pursuing a purchase...Firstly, I had reached out to Tascam over the past couple of weeks (both through their online contact portal and via phone) as they do not provide or publish and any performance information regarding the built-in mics (e.g. frequency response graphs, EIN noise figures, sensitivity, etc.) in their advertisements or user manuals beyond that the X6 has 10mm mics and the X8 has 14.6mm mics and they could could provide no further specs or information from my requests. Secondly is that full-color touchscreen GUI, way-overkill for a field recorder (it requires too much menu-diving to set things right), IMHO, and all the useless-to-me preset recording modes (something the R-26 suffered from, as well). Thirdly, size and weight and field practicality (read above, dangling wires, etc.), it's all on-par with my underutilized R-26 (and Tascam does not provide their own accessory custom-fit field cases for their Portacaptures as did Roland for the R-26).
Musing here, methinks if one of the manufacturers could provide an F3-size 32-bit recorder with a single 5-pin stereo XLR port (thus negating the need for any cables) one could easily rig any stereo field mic to a shock-mounted pistol grip and be off and running...something already possible for mono recording with a single mono mic with the F3.
Anyhoo, that's it in a nutshell.
Jimmy G