I just bought and recieved a Notch. I don't have any use to report at this point other than setting it up in the back yard. I do have two decades of backpacking experience and a couple thousand trail miles under my belt with another solo shelter so I have a pretty good idea of what I want in a shelter and how I'll use it.
At this point, I think it is the perfect shelter for how I hike. I use trekking poles 100% of the time, hike alone 95% of the time and I prioritize weight, ease of setup, small footprint, stability and packed size.
It nails all those areas and it fits me well. It isn't a super size shelter like the Rainbow but that isn't what I wanted. I like the symmetric design that is compact because it helps in ease of site selection. I don't spend a lot of time in a shelter so for me it is end of day where I read and sleep. I get up in the morning and pack my tent and move-out. It provides PLENTY of coverage with the dual vestibule design but the actual sleeping area (inner) is fairly compact. That would be a problem if it were a single wall shelter due to the proximity of condensation but it is a non-issue with the Notch.