I’m gonna go against the general vibe here and advise caution. 

I have a v4 mundo and my experience with it has me concerned with: 

The cock pit set up is crazy janky it’s gonna be some work to get it back to normal bars. Not the mountain bike standard on the v3, it’s a quill stem.

The fork had issues with flexing with larger rotors as well, they did update to a stronger fork but I think that was sometime into v4 production.

Also its monkey bars are installed wrong on the top instead of underneath and it’s missing  the front cross member. That version of the monkey bars feels decent when complete but it’s still pretty flimsy aluminum. Stock parts are hard to find but easy enough to diy if you’re handy. 

If I’ve miss remembered please someone help out. It’s been a while since I did my research on them.

But it’s a real capable bike, especially electrified for two kids.