I had the overshoes and cap, the overshoe zips went, bu like you said the cap was ok, I had some of their cycling shoes which were ok (bit big for me but thats my fault), the cleat started moving around and I fixed it with a soldering iron to melt the plastic, I retired them to spare pair duties and bought some Shimano's at £60 which are a lot better.
My verdict is that their kit is good to get you going cheaply but you will need to replace it with better stuff,
Decathlon being the next level up in terms of price versus quality and then its LBS wallet assault time, or
Wiggle etc for the better brands.