I just did a 600+ mile jaunt up to north Alabama and back with a friend, and gave the bivy tent a multiday camping test. I did find some weaknesses, but over all I am pleased with it.
I use plastic stakes here in sandy Florida, as the original wire pegs don't hold in the sand. BUT . . . I broke two of the six in the rocky soil of 'Bama! Luckily, the prior occupant of my spot at the first campground left eight wire stakes! They saved my keister.

Second problem was that I broke a section of the foot pole - bent it too far and it split on the first night. Some wire and my multitool, and I soon had it McGuyvered - enough to work okay the rest of the trip!

It rained the last night, and the rainfly kept me comfy and dry. I used a piece of plastic sheet as a groundsheet under it, with a section extending out the front side. It helps keep the dirt and leaves out of the tent.
The fixes are easy - I have plenty of spare rod sections I got from Wally's, and I'll carry the wire stakes next time up north.
So, the bivytent is well worth the $25 I paid for it!