I've just bought an M100 and 15-45mm kit from John Lewis which had a £50 off offer when exchanging a working digital camera (offer now ended), so goodbye to an ancient Samsung compact of 2008 vintage. The camera (body only or kit) is also currently subject to a £50 Canon cashback from participating suppliers, so the net cost to me is £279, by far the cheapest way to own a Dual Pixel focusing camera. The kit was also bundled with the leather half case which was a bit of a surprise.
I already had the orginal EOS M camera with the 18-55mm lens and the EF to EF-S adapter. I found the EOS M was blessed with the poorest focusing I had ever experienced on any camera, even with the updated firmware. I shot it side by side with my Olympus Pen EPL6, which trounced it in almost every respect. However, I did like the build quality of the EOS M and the touch screen interface I thought was particularly good, the inclusion of a mic input socket really useful. The M100 loses the mic input socket and hotshoe, the build is a little plasticky compared to the original but all the issues relating to autofocus have been completely solved, in fact it focused better than anything else I own (5D2 and M43 cameras). The M100 was incredibly easy to set up comared to something like my OMD EM1. In bright sunlight, the screen is still perfectly usable, I haven't needed to bump up the screen brightness as of yet. The Olympus Pen screen is terrible in bright sunlight but the Pen can at least fit the expensive viewfinder as an option. The M100 video worked perfectly as well, handheld with digital stabilisation. All in all, I've been very impressed with the M100 so far, I'm sure the M5/M6/M50 would be nicer still, but these are multiples of the price of the M100. I think it would make a useful travel camera, perhaps with the EF-M 22 mm lens and some of the smaller EF primes rather than the rather slow kit lenses and provided the user can live with the weak flash and in camera mics.