I've had my eye on this one for a while, very well reviewed and can cut decent length grass without a struggle.
Unlike the cheapies, this is normal mower size, has a steel frame and a dual charger for the 2 batteries.
Not much else to say - hope someone finds this useful!
I'd guess they would break it if removing every time, I just leave the key in it and there's no reason it would break. Can't see why you'd remove the key, if you don't leave the batteries in it then it won't start anyway