I have been doing alot of research into Agile Testing including reading Agile Testing: A Practical guide... and it seems that the consensus is BTS(Bug tracking systems) are bad for Agile teams because they use valuable time logging bug reports that can sometimes turn up as duplicate issues that the dev team has already uncovered. Another con is that they put up a wall of communication between the QA and Dev team. Now i think there are alot of positives in terms of documentation and review and my boss(Team lead) seems to think it is needed.
I wanted to get feed back from the community on the opinion of BTS and how often if ever used in the Agile community. We currently use Fogbugz which is a great system in my opinion.