Doesn't it matter on how comfortable you are at the net and how much confidence you have in your partner? Obviously it is a good idea to take the net as soon as possible, because you're more on the offensive and you put more pressure on your opponents, but if you aren't comfortable at the net or your partner doesn't hit a good approach shot, then you're putting yourself at a disadvantage. Of course I'm talking about match play, but if it's a drill you should ask your coach and see what his intent of the drill is...
Head MicroGel Prestige Pro w/ Luxilon Big Banger ALU Power Rough 16L @ 56lbs
Gamma Progression ST II