I too re-pot as soon as the plant arrives. So many that I have bought from Big Boxers have been seriously root bound, and in need of new soil. All of them that I've re-potted have done fine.
And the only plant that had bugs was a Myers lemon that has scale. I've been spraying it with insecticidal soap, but have not yet eradicated the pests. The four, huge lemons are turning yellow.
