Heat wise its great, I use a footprint which adds insulation as well as keeping the tent clean and I also have the carpet which is ace, even though our camping buddies laughed at first.
I've been lucky as my mate has his own independant camping/outdoor shop so I've had the opportunity to try loads of 'demo tents' so to speak.
This is by far the best tent I've had, the extra porch canopy is ideal if the weathers not to good and theres acres of room inside. Stability wise, this is the most rigid tent we have had, the gales in Northern France in August were incredible, and I was a little worried, but the tent was fine.
I would recommend the footprint and carpet no question, and now is a good time to buy tents!