Having a chosen a venue for my 40th birthday party without a licensed bar, we wanted a way to get the party started and put everyone at ease.
And wow did the cocktailshakerboys make that happen very quickly?  Within half an hour all the guests were talking about which cocktail they were going to have next.
It was a great way of getting everyone meeting and talking as they all gathered around the cocktails.  The following day everyone told us how much they enjoyed the party and especially the cocktails.
The whole experience was excellent, from meeting with Andrew & Steve, to discuss the party theme and what cocktails we might like, to seeing the menu they prepared.  Then on the night they dealt with everything, leaving us to welcome guests etc.
I would strongly recommend the Cocktailshakerboys if you want to hold a party that people will still be talking about months later.