The cool thing about hives is that the WILL follow the player for a little while until they die off.
They are also much better then tubes when it comes to building them high and out of the way of nades. Tubes are proximity based thus wont do u much good on a highish ceiling, where hives do a spendid job.
One drawback is that hives don't slow hummies down, so an adv. monkey can run past and to the OM just long enough to nade/saw it (bad tremma!).
key to the effectivnes is 2 tubes, one trapper and rest hives. This will prevent a quick attack from hummies just long enough for aliens to come defend. Anything less then a bsuit is dead on the spot. For a Bsuit, a granger lick is needed for a finish.
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how high can a trapper be place while remaining effective?
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