Those were great budget waterproof gps devices for motorcycles. Put one on my uncles harley and my dads harley. They do lack a lot of features of the 660, it all depends on what your uses are for it. With that though you need to buy the wiring, mount, ram, etc. It adds up, still cheaper then the Zumo, but with the Zumo you get everything.
I forget the specifics, but what you need to do is delete the base map and write the new map on top. I have to do this with my 2720 every time I update the map as it only has enough storage for one map. If you google it, I'm sure you'll find the directions.
this is my problem with GPS hardware, it's useless.
The Ipod is durable, the software on the app is so much better than all GPS' and can be multipurpose.
Paid 300 for the Ipod, 90 for a GPS enhancer and like 20 for the app - instead of the 800 for the zumo.
However if you like to tinker with the gps while you ride, then you may need to get a GPS with buttons instead.
While Zumo's are unbelievably overpriced, I have yet to see an iOS or Android app that is as versatile as a dedicated GPS. Not to say that they can't be, they're just programmed to be as simple and basic as possible that a lot of the advanced features get tossed aside. Things like route tracking, uploadable routes, custom POI's, multipoint routes.