I have read this series many times and it is still as good today as it was the first time I read it, almost 15 years ago.
I think the plot is one of the more interesting in the fantasy genre. Tristan and Robyn along with many other interesting characters are trying to defend their Isle/Goddess from the attacks of an evil god and his minions. I enjoyed the fantastic creatures, especially the little Psuedodragon as the comic relief.
I hope they re-issue this series so more people can enjoy this wonderful story filled with werewolves, unicorns, sea creatures, magic and intense battles.
Find it or borrow it! A must read.