Excellent warm jacket
I'm very impressed by the RAB Microlight Alpine jacket.
I looked at many lightweight down jackets from other (more expensive) outdoor brands, but living in a wetter/windier area of Australia, I opted for RAB's offering which has a heavier face fabric and Nikwax-treated down, which the other jackets did not have. This means the RAB jacket is slightly heavier than others, but offers much better weather resistance, which was more important for me.
Its warmth-to-weight ratio is excellent and the fit is great, I'm a medium and can comfortably layer under for extra warmth or fit a shell/rain jacket over as required.
Delivery and service from Dwights Outdoors was excellent and I would not hesitate to purchase from them again.