Re: Performance? Art?
Good enough. It should have traffic congestion data coming in via RDS, although I suspect that's gotten disabled with some firmware upgrade. It used to work, also with OSM, but I haven't seen it show up for a while.
Just feed it a fresh set every three months or so and you're set. We've got the 1490, which takes microSD where you just plop the map on, but models that present as mass storage when you hook them up to USB should work OK too. OSM has a section on their website where you can build maps for the area you need, with output in Garmin format.
