I just received my Tarptent Notch. It is really, really yummy! Haven't used it in the field yet but it sets up nice and taught - really stable through the ridgeline. My only criticism thus far? I would prefer a bigger stuff sack (ha).

To the OP, I prefer more room to less for a winter shelter. The Akto is a bit small for extended stay and as Franco mentions, it isn't going to be optimal in snow loading conditions. 'Doable' but not optimal. The Scarp with the crossing poles will do much better with static snow load.

However, I am a big fan of the Hilleberg Nallo 2 as a solo winter tent. Very strong, good ventilation, double walled, easy to set up, and will last a lifetime.