I haven't heard anyone else around here chime in about the Mash & Boil or other similar things like the Robobrew or Grainfather. If you have any questions I'll be happy to try to answer, but admittedly you'll be getting the opinion of a homebrewing noob who hasn't done all-grain any other way.
I'll say that I've been very satisfied so far. I did my fifth brew on it today (AHS Irish summer ale), and I'm still feeling a few things out. There have been a lot of discussions online about tweaking water volume, sparging techniques, circulation techniques/mods, and using bags to improve efficiency. I tried some of the volume changes and circulation recommendations (haven't modded anything) with mixed results. The beer has been good, but efficiency has been variable, and I've been off gravity measurements by as much as 10 pts.
Today I went with an updated recommendation of using 0.3gal strike water/lb of grain from the official M&B blog designed to improve efficiency, and I hit the OG spot on, so I'll stick with that for a while (though the mash seems super thick) and see how the next few batches turn out.
For reference, here are some links to discussion boards that I've found helpful, and may be useful to you: https://www.beeradvocate.com/community/threads/brewers-edge-mash-and-boil.489551/ https://www.homebrewtalk.com/forum/threads/brewers-edge-mash-boil.595987/ https://www.homebrewtalk.com/forum/threads/would-anyone-buy-the-robobrew-over-the-brewers-edge-mash-boil.648880/ https://www.reddit.com/r/Homebrewing/comments/79a524/brewers_edge_mash_and_boil_first_use_thoughts/ https://www.reddit.com/r/Homebrewing/comments/99nxh1/tips_for_brewers_edge_mash_boil_setup/