Thanks for the reply. I don't think I'll ever use the TPS feature myself but never say never. Certainly a lot of riders like that feature. I thought I'd still be using my first gen. 660, so there you go.
One feature I do like on the 595 is the ability to store / track bike service. I keep a running Excel sheet for everything now, but I can see using the GPS to simplify process.
Maybe there's a way to export the records to Excel, or to see if I can import the Excel sheet I already have?...hmmm haven't spent enough time looking at the possibilities yet.