I picked up my shiny new "Dynamic Red" MG3 in Trophy Spec on Sunday, already put about 100 miles on it, mostly on daily commuting. I have a 10 mile commute each way every day, through the South Wales Valleys and it's been brilliant. I'm averaging a consistent 60MPG, which i'm very pleased with.
The car spends plenty of its time in EV mode, if it has sufficient charge then under 30MPH the car basically lives in EV mode. Over 30, it's a flip of a coin if the engine will kick in or not.
When you put your foot down the car will rocket off. I'm still very much getting used to this, it's very unusual to me. I keep my Regen braking on max (Irritatingly it resets on each restart of the car, so you'll need to set this every time you get in, but I mapped it to a steering wheel button) and it regens very aggressively when you let off the accelerator but does a fantastic job of pumping charge into the battery. I've seen as high as 40kW going back into the battery, but that was from 70MPH. From 30mph, usually about 20-25kW goes back into the battery for a few seconds, but rapidly fades off. Once under 10MPH regen is almost nothing and you have to get on the brakes proper - No one-pedal driving here.
I moved to this from an MG HS (Petrol, not PHEV) and although it's a bit unusual getting used to a much smaller car, I am enjoying it. The HS was always too big for what I needed.
I use Android Auto on the head unit, with the AAWireless dongle for wireless connectivity (If anyone cares, setting the AAWireless dongle to 190 gets you the nice wide display and plenty of map room).
The USB C port on the center console, next to the AA port appears to have been made wrong, or is just badly implemented. My phone gives me an error when I plug it in there, luckily I bought a low profile USB PD adapter for the 12V socket which works great. I still need to try some other cables, and see if that's perhaps the issue.
The head unit is great, works well. Vast improvement over the HS's buggy piece of crap. My main irritation with the car are twofold.
Firstly, there's a weird bump at the back of the front seats, which is not very comfortable. You can adjust your butt to where it's less of an issue, but if you move again then you fall back onto it. I'm a skinny guy, but if someone was more well endowed in the rear, then perhaps they'd find it comfier. Until then, i'm Princess-and-the-pea'ing it. This isn't enough for me to write off the car, as you can work around it fairly easily, but it is irritating.
Secondly, I hate the "corner 360 camera" feature. When you are going slow (under 15mph) and indicate, the car automatically turns on the 360 camera to "help guide you". This is incredibly annoying, because stuff like leaving a car park is very slow and requires lots of indicating as you come out of the space, leave the aisle, leave the car park, rejoin the main road. And every time it does it, it causes the entire screen to flash and it keeps screwing up Android Auto. I've stopped indicating nearly as much to try and avoid it.
EDIT: If you bring up the 360 Camera, there is a hexagon button on the overhead view. The option to disable this is called "Steering with Peace of Mind" (Which is a terrible name, and also not referenced in the manual at all)
I do actually really like the car, but i've only had it for about 72 hours, so i'm firmly still in the "honeymoon period" - In a month or so I think i'll be able to give a slightly more measured review.