Taking my own, different tent as an example, I share your concerns somewhat about what might come across as flimsy material (which can be quite jarring against the astronomical price e.g. $440 for my Moondance 1 Mk I in 2009, versus $879 for the Moondance 1 Mk II in 2020). I sussed the materials out over a lengthy period of time before eventually purchasing in November last year. In the store I crawled in, moved around, sat up (BIG improvement over the Moondance 1, moving around won't be a problem at all in the EX). Go into the store and thoroughly check it out; take your walking companion with you: both get in to get a feel for the amount of room. I think you will find the EX will be more comfortable with
2 people and their gear, not 3, as well as more sensibly 3-season use. For true 4-season applications you should look higher up in the tent range where the tents feature more robust materials and designs. The Moondance tents are great for being free-standing and portable, but they can be troublesome in high winds and claustrophobic the more people and gear you carry in.
My initial reaction upon the requisite touchy-feely of the tent in the store was "
that's very flimsy!": a landing comment made by many people!! It's also very, very expensive for what it is. Top marks for the quality of the poles; average marks for the
very flimsy guylines.
The tent you are interested in has the same construction standard, with slightly higher denier count of 30D (cf. Moondance 1 FN
20D), including poles (which are amazingly flexible, more than I can say for the tent pegs, which one should replace with 'X'-profile pegs; the supplied pegs bent too easily on my first 3 outings). The "rice paper feel" of the fly should not put you off; it feels slippery and uncertain, but it is very, very well proofed and reinforced at stress points. It's probable that a falling branch (not a huge one!) would be sufficient to puncture/tear the fly compared to, for instance, the more robust fly on my MacPac Minaret, which has a similar but slightly thicker fly material. Don't use any sharp items in the tent or nearby where they could contact the fly or floor. Repair patches are supplied with the tent.
The side-fly tension loops on the Moondance models can be somewhat irritating to adjust. I think the design here has been over-thought, and come out as more complicated than it needs to be. The design was simpler and fuss-free on the first-generation Mont Moondance tents, then this curious fly tensioning arrangement came along that requires some practice to adjust correctly. It has certainly been the subject of discussion when I've gone bushwalking!
Invest in the Moondance footprint if it isn't included in the tent price upfront. It is a ridiculously pricey addition, but it will go some way in protecting the equally thin floor from pinholes and rock punctures.
Colour? Um.... Well, I'm fine driving a
red car.

But not fine living in a red tent! The colour options are very narrow unfortunately. I opted for the yellow fly; can't stand the tent being filled with bright red light the moment the sun makes an appearance!