Tatyana, We have a 275T and used in France last year. It was our new best friend. We would have been lost without it. It goes everywhere we go. Didn't want to have it stolen.
You don't need an SD card. Both US and Europe maps are internal.
I also have the lifetime map update. Just updated recently. The update takes a long time.
One of the things we really like about the 275T is that it is small. It fits easily in your pocket so you can take it with you on walking tours. You don't need the big screen when driving.
When we travel, we take a camera bean bag for pictures, but also use it on the car dash to hold the 275T. We didn't want to pack the dash holder which works really well.
You are also able to subscribe to a service that helps you identify speed cameras.
Traffic alerts come free.
Like in earlier posts, you have to use common sense, so configure it so that it stays on the main roads (fastest times) instead of the shortest distance, which can take you thru very small roads.
You will love it.