It's not that Opus are necessarily the best, it’s more that they are the ONLY T&T ISP who seem willing to offer tourists a financially acceptable short-term access solution.
TSTT were supposed to have offered a similar “guest” facility, but it was very expensive. I can’t find any details of it on their website (http://www.tstt.co.tt) and they ignore my emails asking about the service (surprise, surprise!!!).
Steve Wooler myTobago.info - the definitive Visitor Guide to Tobago