I've had my Fly Creek UL1 for 4 years and have not seen any abnormal wear.
I have never used more than 6 stakes to set mine up.
I have never had any issue with rain getting in but I am also smart enough not to unzip the vestibule all the way when it's raining. I'm getting on in years and aren't that nimble anymore but can still easily crawl out through a partially opened vestibule.
I'm six feet tall and haven't had any issues with the length of the Fly Creek although I wouldn't want to be any taller in this tent.
The issues I do have with this tent are:
Getting sand in the buckles that hold on the fly can lock them up tight. On one occasion, after 10 minutes of trying to get the buckle undone, I was about to smash it with a rock when it came loose.
The zippers snag very easily.
When wet, windy and cold, the fly will sag and stick to the mesh inner tent. It doesn't matter how you guy it out this will happen if the conditions are right. It hasn't caused me to get wet but it's annoying.
This year I've been using a Tarp Tent Notch. I like it but I also miss the Fly Creek. I may eventually go back to the Seedhouse SL1 as it has more room than the Fly Creek and is only a few ounces heavier. The Notch is great when on the move but I base camp and day hike/fish quite a bit so I have to carry the extra poles which makes the Fly Creek and TT Notch almost identical in weight.