Working in a high profile guitar store for 14 years taught me that all guitars whether they be relatively cheap or highly expensive all needed some adjustment to perform to the potential they have.
Obviously as you would expect the cheaper guitars will generally require more attention than the more expensive ones, and with the increasing numbers of guitars bought without at first playing them from internet companies, or via mail-order the benefit of a good setup is very important.
Donít believe the hype when many internet companies promise a fully setup guitar, rarely will they get the attention they need and rarely will they be setup by a trained professional.
Think of a guitar setup much the way you would a vehicle service, as any vehicle not serviced properly will perform badly when driven, just as a poorly setup guitar would play badly and cause unnecessary problems for the guitarist, thus making it harder to learn and more frustrating to play.
While a guitar setup may seem a simple task the problems you can come up against can be baffling and frustrating. Bad tuning, buzzing and rattling, intonation problems and electrical nightmares are all too common and could easily be remedied by a trip to myself.
On closing I would recommend getting your guitar fully setup at least once a year, and probably more if you are a full time musician, and if you are seriously considering changing your gauge of strings permanently then a setup is essential.