It's nice, but..... I think Wikipedia works better in the native browser. Pinch to zoom doesn't work in the app, and for my money, wikipedia works particularly well in the browser's reader mode.
I tried it and didn't think too much about it; not really sure why I didn't like it. I guess I prefer using Wikipedia via the browser. The one thing that I did appreciate is the ability to store my history of what I looked at - I can see that being quite useful.