For those going to use the GlobalSync utility with 10.8, just a note that the 'Download' icon is missing and broken. You can, however, select 'Download' from one of the menu options.
I was also able to use GPSBabel (dated 09.03.12; no version) and GlobalSync to download data.
I was able to view configuration options for the BT-335 via GlobalSync.
Great blog entry on BT-335 and Mac:http://bioneural.dyndns.org/2008/06/24/geotagging-with-the-mac-friendly-globalsat-bt-335/