The EOS R is Canon's first serious entry into the mirrorless market, and it has definitely been a bit of a polarizing camera. This fairly comprehensive review takes a good look at the camera and what Canon got both right and wrong with it.
Coming to you from DPReview, this great video follows them as they take an extended look at the new Canon EOS R. The EOS R seems to be a bit of a perplexing camera in that it has some very interesting and innovative features (in particular, its control system and customizability seem to be quite good) and its ergonomics are typical Canon (namely, they're good), but it also has some frustrating limitations, particularly its maximum continuous rate, its 4K crop factor, and its single card slot. While the camera itself is a bit of a mixed bag for sure, there does seem to be a bit of hope for the Canon faithful, as the lenses Canon released along with it do seem to indicate that they're taking mirrorless more seriously this time around, so hopefully, we'll see a more advanced body come out in time. Until then, the EOS R may still be an interesting option depending on what you shoot.