We bought this docking station because Gamestation had 2 sorts and this was the one which had its own battery-things included although it was a touch more expensive.
We have never had a problem with it, it charges quickly, the batteries last for ages whereas before we were going through loads of cheapo batteries! It matches the colour of the wii and the battery-covers are rubberised so they are non-slip which is great.
The only thing which I have only recently noticed as a slightly possible hindrance is that it does need its own plug socket which can be a bit of a pain because our wii is in the living room amongst the tv, dvd player, vcr (yes I still have one!) and cable box so there are lots of wires but it just means it can be plugged in when the wii isn't being used and kept with their charge until needed.
I will probaby end up putting mine on here to sell soon though because for no reason at all my girlfriend has just decided to go out and buy a new charging station which plugs straight into the wii so there is no need for an extra plug socket. BUT it hasn't come with it's own batteries so we have to go out and buy new rechargeable AAA batteries for each wii-mote, it will only charge when the wii is in standby mode which I believe defeats the object and considering we can't keep our wii on standby between uses, we have to turn it off at the plug because it throws a wobbly and we need to reboot it anyway, I can see the situation getting beyond annoying.
I prefer this one, it's always worked, works well with my temperamental wii and is worth the extra money. All I can say to those who's have died - just take it back and get a replacement and if that doesn't work get a refund, but you will always get the odd few that don't work - one of the drawbacks of technology