I own a nüvi 2595LM (and another nüvi 250W, very old). The 2595LM has been replaced by Garmin under warranty.
But this is not the worst thing... The problem is that it is SLOW if compared with the one I have in my car (normal car, bought in 2013, so old like the GPS) who is a LOT faster!
The Garmin has the advantage that can be used with a computer, you can download data etc. but it is too slow. Current price (2020) is 199 Euro. Not cheap... Still on the market but it is really obsolete, when I drive in big cities it loses the point or make confusion with bridges or elevated roads.

I would like to buy another independente GPS but, now, I do no trust these devices. I think I have to find a way to understand their CPU power, like in the PC, before buy again...

A comparison like the ones you can find for AMD/Intel CPU would be useful.