I just got one too (from PresenceUK via Amazon Marketplace) and completely agree - except I don't find the button fiddly with gloves on (suppose it depends how thick your gloves are). It might interest other buyers to note that the actual make on the sealed blister packaging (at least the I got) is by "Summit" - a recognized brand. The only note of caution I'd gives is to be careful when opening the battery compartment - the underside rear button is stiff (has to be pressed in until it goes under the thickness of the underside casing) and if not careful you might start to pull the whole unit apart rather than just the slim back panel.
The button on top is centred for off, slides sideways one way for 2 white LEDs, and the other way for 1 red LED. The 3AAA batteries are included in the blister pack.