Have you checked the weight of the Marmot Swallow? Way, way too heavy! And the floor space looks very small too.
> How would a convertible tent fare versus a full on winter tent?
I don't think this question has any answer. The terms 'convertible' and 'winter' have little meaning once the spin doctors have been through. *Every* tent is utterly perfect - according to them. You need to look at each tent as an individual.
Sorry: >40 C here today, and I am feeling very hot. :-)
Cheers (from Australia)