I'm getting on really well with it so far. I can't say I've pushed it that hard but day-today driving it works great. I have noticed it's jerkier than the A4 DSG when slowing down for roundabouts etc and it can jump around gears a bit.
The one thing I am having to watch is I've become too used to a FWD car with <200bhp. When I wanted to drop the gear down in the A4 I'd just mash the peddal to the bottom to kick it down. I tried doing that in the Mustang once and almost had a brown trouser moment! I'm now using the paddles when I want to drop it down a gear.
I will check exactly next time I take it out but from memory it's around 1800-1900 rpm
If your commute is on country roads and the traffic isn't too heavy I'd be going manual. I only went for an automatic as I spend 75% of my time on the motorway or A1.
Do not drive aggressively in full auto, I REPEAT, do not drive it hard in full auto, if will send you backwards in a hedge. Keep it on the paddles and ideally in sport/track mode so your in full control, even the upshifts on the 10-speed can un-balance the car as it shifts rather firmly at full chat, so again keep it in gear throughout the corner, I know a few people who have being caught out with them.
Its not a 4 pot twist and **** engine, its a V8 with a huge amount of torque in comparison and it can very quickly break traction.