@rubber_B: I’ve used a tomtom rider for the last 7 years. I’d be lying if i said it was faultless, particularly their warranty support, but its pretty damned good.
I build routes for our tours in Microsoft Mappoint (its much less laggy than Google or TYRE & I’m not limited to 26 waypoints), export via itn converter as an ITN file and copy straight into the Rider’s ITN directory. The ITN file structure is very logical & simple – you can crack them open in notepad, give things logical names and move them about. Technically the XML based structure that garmin use might be better, but it’s a bleeding nightmare to meddle with.
My riding buddy has a wretched Zumo, so route building needs tyre as a further intermediary before syncing via the virus-on-a-stick that is Garmin Basecamp. For some god-forsaken reason the cretins in Garmin require the zumo to be powered on and connected before proper route planning can take place – you can’t just give the zumo a list of waypoints, it seemingly has to do the planning for basecamp while syncing.