This is the first sat nav I have ever bought, so I spent quite a bit of time reading reviews and talking to friends with sat navs.
I've read some negative reviews about the nuvi 1340, but decided to take the plunge and so far - five days in - I haven't been disappointed.
It is very easy to use. The screen is big and clear, the instructions concise and easy to understand. It updates and recalculates routes, when I have purposefully gone the wrong way, very quickly. There are other useful functions on there, like the points of interest, and the 'where am i' function would be very useful in an emergency. Safety camera alerts are a Godsend.
I appreciate that different people have different expectations, but I'm quite demanding and wouldn't waste my money on a pile of tosh, so I can recommend this sat nav.
***Update***
I've had it for about five months now and still think that it is fantastic. It has got me around the UK and Europe with no problems at all. It was great for finding a petrol station in the middle of France when I needed one on the hurry up, for finding a cashpoint when driving around rural England and for finding a Thai restaurant in Bournemouth when we decided what we wanted to eat on a whim. Ten minutes and we were there.
What's more, all that driving and no points on my licence thanks to the camera alerts.
This sat nav is a very, very useful piece of kit.