We considered having one of these as they do look cool, but before we had booked our venue we were still thinking of a city wedding and those places needed that extra bit of decoration.
Although the prices to buy bottles of vodka etc were very steep, one venue was charging £70 a bottle. I know what my friends are like and I couldn't give them just one bottle and tell them to play nice!
We've now decided against the idea as it wouldn't suit our venue. Still think they're great. Got to say I'm happy to be saving the £500+ it was going to cost as we were looking at doing a combined luge and seating plan.