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Independent auditors confirm top VPN doesn't log your data
(www.techradar.com)
This is a most excellent place for technology news and articles.
You have no problem downloading because your client is initiating the connection. But people won't be able to initiate a connection to you. If you're just leeching off public trackers and don't care about your ratio, then that might not matter to you. But if you're trying to maintain a ratio on a good quality private tracker that's a no go.
You can use a site like this with your VPN ip and the port you have configured for bittorrent while your bittorrent client is up to see if you're connectable.