If you play with the Roid calc (
http://www.come.to/roidcalc), you'll see that frontloading is real and makes a difference. Basically, by doubling up on your dosing the first week, you bring your accumulated bloodlevels to near max within a week. Otherwise it could take 3 to 4 weeks to reach this level. This is why people often refer to Test not kicking in until week 3.
Ideally you want a cycle that has a 'Devil's tower' proile i.e. a steep increase in blood levels, a long plateau, and then a sharp dropoff. You can achieve this by frontloading the first week or two, maintaining for a few weeks, and then switching to shorter-acting esters the last few weeks.