An exceptionally good test drive result may cloud your decision-making abilities so much as to cause you to be blind to the disadvantages of owning a particular car. It would be advisable to test drive other cars to have a real basis for comparison. Driving them back to back could uncover even minor differences which will hopefully lead to a wiser decision.
Never give in to the pressure exerted by sales people. It is their job to sell. You, on the other hand as the buyer, will be committing to a responsibility to pay for several years. It is your right to satisfy questions you may have before purchasing.
