For me, Wayfinder was unusable for anything more than a display of my current position. Maemo 5's Ovi Maps was a wonderful upgrade, being that it's actually usable for finding a route, and Sygic was another step forward.

Wayfinder could only find addresses if given a Zip code, not the town from a mailing address, and no one provides a Zip code when inviting you over or providing their business location. So, the only way to use Wayfinder was to first look the destination address up in Google Maps to find a Zip code. That required a data connection and too much time and hassle.

Ovi Maps and Sygic can find addresses by postal address town, making them at least usable. The actual maps in Ovi Maps seem quite out of date, and Sygic suffers from a horrendous UI, but they manage one of the most basic tasks of a GPS application: allowing the entry of a destination address.