As do others on here, I use a Garmin 760. It was purchased with free updates for lifetime using Garmin Express. All I can do really is echo some of the more negative comments about it! Some examples:
My motorhome is kept at home. Leaving, I always get the message "motorhome access unknown." That doesnt come when returning.
Quite often, it tries to take me on parallel roads to motorways and autobahns, only to rejoin it later. For some reason, this happens mostly near airports such as Frankfurt, Copenhagen.
Possibly the worst thing though is the fact that with every update, it seems to get more and more inaccurate. Currently, its about 400 metres wrong on some motorway exits.
Even if Express is easy to use, my opinion is that it does tend to be a bit slow updating even with the 100/100 line I'm using at home. Sometimes, I'm not even sure if the maps really are updated. On one route I travel on a regular basis, a roundabout that has been there for years is still not shown.
To complete the very first update, I had to buy a memory chip as there wasnt enough internal memory.
According to Garmin here, their now discontinued BC20 reversing camera will not work with the 760. Their BC30 is incompatible. More out of curiousity than anything else, have others found the same?