I am all for topping especially when combining it with LST, its an easy way to keep your plant small enough so its easy to hide but still give a decent yield. uncle bens guide has some pretty good info in it, just dont top too early, wait till the 3rd or 4th node appears then top. then as the plant grows out use small tent pegs or bits of wire to pin the limbs down.
when you pin a plant down for LST it allows more growth to sprout as it reaches for the sunlight.