Most will come "in tune", but with string and cables stretching over time, changes in cam synchronization are probly inevitable. String adjustments an changes will be needed over time. Cams need to be level through the entire draw cycle. A nearby, competent pro shop/technician can do these things for you....OR....you can buy a bow press, study and learn to do yer own work....OR....you can buy a revurve crossbow and avoid all the minutia required to keep a dang wheelie crossbow shootin right.

 

Yes they have to be tuned like a compound. Think about it a crossbow has two cams, string and 2 cables. Just like a compound.

 

I new flagship level bow should be tuned when delivered.
Things to check/watch: ATA, cam sync, cam timing, distance from rail to each axle (should be the same) if it changes it could be weak or failing limb.
Keep an eye on servings for wear/separation.
Some bows need "tuning" of the arrow retainer.

 

You can also tune the bolt to the bow. There are spines and weight that can change the performance of flight. FOC is often over looked but important.

Center of string. Mark center of string at rest then cock and make sure it is centered to flight deck.

Cams level at rest and cocked as well as timing. Mine have white paint marks so I can tell if they move.

All need adjustment over time and just because you blow $2 grand on a crossbow doesn't mean it will out shoot my Barnett at 1/5th the cost.