Pre-meal boluses are designed to cover the food you eat during a meal. Since you can program the bolus any time, you have much greater flexibility with regard to meal time and contents. If you decide to eat late, you just program the bolus later than usual. The number one reason to consider an insulin pump is flexibility. You are also able to sleep late without worrying about your blood sugars going high because you have basal insulin continuously infused by the pump.
Pumps deliver insulin much more precisely than anyone can with a syringe or pen injector.
Pumps typically can be programmed to deliver insulin in 0.1 unit increments. Such precision is not possible with today's commercially available insulin syringes or pens. Pump users almost always report better control than they were able to achieve using even multiple daily injections. A recent study demonstrated that insulin pumps are better than multiple daily injections for adolescents. Many people feel that pumps are better for everyone who uses insulin.