High Countries in general and 343RL in particular

[DQDick]

We have some friends we worked with several years ago that are looking at a 2015 343RL. They tried to access the forum, but ran into problems. What they asked me to find out is:
1. Do the High Countries hold up?
2. What problems should they look for, if any?
3. What's the good and the not so good about the 343RL?

Thanks in advance, High Countries are one of many areas where my ignorance would show