My domain transfer from Dotster (formerly 000domains.com) is now complete. To their credit, they provided adequate service for years until their platform migration snafu and did address all my open support tickets even after I had begun the transfer process to pairNIC. However, I am greatly relieved to now have all my domains with pairNIC, who are just great to work with and have a higher caliber of technical expertise directly available to customers.
Let me know if you encounter problems with accessing any of my sites or if any mail bounces, but I think everything is now working correctly.