I always think controls are the most neglected aspect of gun buying, but one of the most important aspects in reality.
Finding out that you don't really like working the controls on a pistol after you've already plunked down the cash is finding out a little too late, but so many people don't take controls and MOA into consideration when they're buying.
I know someone who purchased a Nano - which IMO, and his opinion has a nice trigger and shoots great. But he started to feel uncomfortable carrying it in his pocket with the trigger the way it is, he really started to want a thumb safety. A lot of people test a gun's trigger, they see how it feels in the hand, they might shoot it at the range but the whole time they're not thinking about what they have to do to draw from the holster to deploy the handgun and shoot and they don't think about carrying the gun for hours day after day in their mode of carry.