If you're into Reggae/Dancehall/Soca music, or just into the West Indian Culture in general; of course it's worth the trip. Aside from all that a lot of people come in from near and far to take in Caribana.
^ trust that.... honourable mention also J'ouvert on Friday night before the parade, Soca in your backyard (wild water Kingdome) and Soca Rave or Fire Fete are definitely banging. The only drawback is the tickets to these events are like $30.
get tickets beforehand or else you'll be spending $60+
looking for (sz 12-13):
safari dunk high
AM1 NL cement (black)
blazers (viotech/pinstripe)
sb classics