I was out with them a few years back, highly advise taking dual ply DH tyres!
I had a single ply minion and had 5 flats in 6 days riding on my rear alone. Not only is it a hassle, but it holds the group up while you fix it.
As for what to expect, a real mix! From a day of terrible XC climbing (on a heavy 6in AM rig) to a days uplift with the vans, to a days pretty exposed high altitude stuff! Good mix for most groups.
NB: XC was shit as I hate XC! Uplift was great as I love going fast without having to earn turns 😉
The ‘epic’ ride was amazing (HEIDI), stunning scenery, great trails. Long day but well worth it.
Food and accom were good, guides good.
Enjoy!