Performance Systems International Inc. Bot

Agent: Java/1.6.0-beta2 and Mozilla/5.0 (compatible; MSIE 6.0; Windows NT 5.0)
Host: 38.99.203.110

Whois Record
OrgName: Performance Systems International Inc.
OrgID: PSI
Address: 1015 31st St NW
City: Washington
StateProv: DC
PostalCode: 20007
Country: US

This bot visited an unprotected site last July. It grabbed the robots.txt and then proceeded to download every link on the site, including javascript files.
It is now blocked by ip and user-agent (^Java).

It has since revisited the site twice. Today it tried to grab robots.txt and was sent a 403 code (denied access) as Java/1.6.0-beta2. It then changed its user-agent string, four second delay, to Mozilla/5.0 (compatible; MSIE 6.0; Windows NT 5.0) and tried to grab the main index page. Again denied, it seems to have moved on.
It appears to be hosted by Cogent Communications.