I really like the Grenada UC experience - I last visited on 18th June. You are whisked off in a buggy after check in (weather permitting- if its raining hard you walk along a covered walkway to be met with umbrellas for the short walk in to IAM jet centre) to private security with absolutely no queues. Seating area in lounge is comfy and as Dan says you can help yourself to snacks and drinks.
Sitting in the lounge as I type. It is absolutely fine, roomy, cool and the wifi works. Food is of the crisps variety and there are plenty of booze offerings. After two weeks at the wonderful Spice Island I need to start a diet anyway.