In the short time we've had this product (five or six weeks), everything has been really good. It installs easily and works safely and effectively - no problems of any kind. So far so good! But we’ll have to wait many more months to test one of the more important requirements which is, of course, that the battery continues to perform well over a reasonable period of time. So far I’ve only awarded one star for battery life because we haven't had it long enough to give anything higher. But the signs so far engender optimism.
As things stand, I’d definitely get one of these again.