The young guy is friendly but that is more than I can saw for the owner.
We also had the vouchers and had great service our first time there from the young guy.
But things were not that great the next time we were there. I saw one 'no sampling' sign so I wasn't sure if I should ask. I didn't.
For what it's worth I don't think this place is that great. I would give this place 4 stars on our first visit but just 2 for the second. Owner needs to lighten up if they want to stay in business.
If you aren't going to offer samples to customers that is going to make it challenging for people who haven't tried all those exotic flavours.