I'm really happy with the Sumo. As expected, it boils water ridiculously fast, especially when I cook for myself and only need a cup or two of water. I've only used it on one backpacking trip on the AT. The stove is nice and light, durable and cleans up beautifully. Despite the simmering concerns I've read on other reviews, I was able to simmer dehydrated soup for 10 minutes in a light breeze with no problem. Stiffer winds might pose more of an issue, but I'm sure that can be managed.
This review was written in the old system and had content requirements that are different than reviews written today.