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There are a lot of piers around with cages of some sort. If you are pouring your own concrete pier the placement of the J bolts and angular spacing may not be very precise. A cage used in that situation provides a good way of presenting a load equalisation platform for your mount adaptor. Of course extreme cages are not a good idea, and mine is minimal height off my poured pier. Levelling is not important for EQs but good weight distribution and support is important. There are hundreds of piers with cages, and as long as they are designed to support the equipment used they are ok. That said, cages should not be used as pier extensions imho, there are better choices (like pipe sections).
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