I just tried Wing FTP server and it's really good, the web client is lightening fast compare to serv-u's, hehe.
I wish I can see IPv6 support in future version of Wing FTP server. As we know, IPv6 is going to replace IPv4 eventually. In China, many universities' network already have support for IPv6 and had join CERNET2, the main IPv6 internet built by Chinese gov. Gene6 FTP server has IPv6 support almost 3 yrs ago, and XLight FTP server has complete IPv6 support.
I understand that IPv6 is still far from mainstream, but I do wish Wing FTP server have IPv6 support in the near future, cause I find that Wing FTP server is fast and rich in features, just like FTPRush.