I opened up the tent box to check out the material and ended up putting the tent together and hanging the light.
For a budget tent its a nice taught fit, the frame joints are bit generous but nothing a few wraps of insulating tape inside won't sort, the material is 100% light tight unlike my previous encounters with diamond mylar tents, the material feels like it'll be tough/resilient.
I've got a £50 mammoth tent to compare it with and the mars is in a different league, it's a sturdy design with clever features, for a mere £50 I'd have no problem recommending one.