I'm not sure this little fellow truly belongs in the Ultralight club at 8.8 oz (For the Mini). But for 3.2 oz more than the Montbell – it comes with some bonus features:
– Windproof up to 40 mph. Or 70 mph for the normal sized one.
– The asymmetric design has a very elongated tail which would cover the the top of a backpack nicely.
I bought one of these on a recent trip to England. I've used it taking the bus to work in Seattle (it rains a lot), but haven't taken it on the trail.
They just recently started distributing these in the US, so you can now buy them online.