IIRC, the stand-alone Metaframe client is much faster. It's what I used when I needed remote access to the Windows infrastructure in the server room at work.
Ya, I'd agree that the stand-alone client is a better solution. Added plus: it seems to like my linux box just fine.
Yesterday, while playing with my 'terminal server client', (Fedora core2) I found that it had native support for the ica protocol. (which is what citrix uses). Excellent!