Accuracy potential is high, especially in the 6.5 Creedmoor chambering with a long, thick cold hammer forged barrel and good rifling. The free-floating / suspended action helps.
Durability and rugged build: quality steel action, robust construction, good finish, decent stock material.
Modularity / options: ability to mount muzzle brakes/flash suppressors, adjust cheekpiece, change magazines (depending on variant), etc.
Calibre versatility: plenty of available cartridge choices if you need more reach or different ballistic performance.
“6.5 CM Desert” presumably refers to the 6.5 Creedmoor chambering, in the Desert finish version. In many listings “Desert” is effectively the Desert Tan / sand‑coloured stock + finish on the barrel etc.
So if someone says “Sabatti Tactical EVO 6.5CM Desert”, they mean: Tactical EVO model, chambered in 6.5 Creedmoor, in the Desert finish.