i dont like the ninja , i bought one and the boab for it ,
they had a problem with the quick release end clips , when i wiped the blade my microfibre use to get stuck on the end clips it wasnt a smooth wipe of the blade.
it also released the end clip when i wiped it so i was constantly re locking it , after a while it wouldnt lock .
i contacted unger about it and they said they were aware of the prob so they sent me a load of replacement end clips .
also the blade didnt fit the boab properley .
i would google the ninja and see what others say .