How have appellate courts treated a plea bargain where a defendant has pleaded guilty in return for a reduced sentence?

"Where the defendants have pleaded guilty in return for a specified sentence, appellate courts will not find error even though the trial court acted in excess of jurisdiction in reaching that figure, so long as the trial court did not lack fundamental jurisdiction. The rationale behind this policy is that defendants who have received the benefit of their bargain should not be allowed to trifle with the courts by attempting to better the bargain through the appellate process." (People v. Hester (2000) 22 Cal.4th 290, 295 (Hester).)