G'day Holly,

The 4 season rating comes from Roman themselves, we don't necessarily know what their parameters are for determining this.
Generally 4 season tents have a higher waterhead rating, solid material on the tent inner, and a more structured frame system to deal with snow load.

At a glance the Roman has the 3rd pole which does ad a geodesic element which would no doubt make everything stronger, my only concern is that the frame is external and kind of creates a box over the front door for the snow to sit in when it falls.  You wouldn't have any natural snow shedding off the canopy, and I don't think it would be an issue to brush it out, that's just something to bear in mind.

The tent inner is also largely mesh, which is excellent for ventilation but not so great if you we're hoping for a solid tent inner.  It won't really effect warmth, just more so wind if you're expecting to be in windy places.

In terms of what other options we have in the range, there isn't a huge amount that also ticks your pack size & weight boxes, and budget boxes.
I'd say as long as you are mindful of the above points, it's going to be a great option all round.

G'day Elisabeth,

I've double checked for you, and unfortunately there are no eyelets on the entrance flap, so you can't set it up as a mini covered space. You could possibly add your own eyelets to achieve this, but the fabic may need some re-inforcement.