Air-Pots kick ass!!! I'd buy them.
They cost about 2X more than a Wal-Mart pot of comparable size and last just as long (unlike smart pots). If you live on the east coast of the USofA,
perfectroots . com is the place to buy from. The 2 gallon/7.5L Air-Pots are the perfect size for flowering clones and seedlings; use the 3 gallon/12.5L Air-Pot for mother and monster plants.
The only draw back is how fast water evaporates out of these pots (as a result, high humidity). Therefore, watering every other day is a must; everyday if you have hot grow rooms. Use regular water in between the twice per week nute regime. Soil run off isn't a problem for the smaller pots, but use window screening at the base of larger pots (2gal+) to be on the safe side. Also if you're using soil and move the pots around a lot, small soil chunks tend to fall out of the sides. So using mini rockwool cubes, STG hail/loose fill, expanded clay, or coco coir, instead of dirt, would be the ideal medium.
On the flip side you get the development of a perfect root system which means plants focus less energy circling their roots; all this leads to plants growing as fast as hydro methods. The roots always stay aerated, so excessive watering doesn't hurt. Transplanting is super easy: just unscrew the holding pins and unwrap the pot. And lastly, Air-Pots disassemble for easy storage.
P.S. For those of you who have the C.A.P. MONSTER EBB & GROW system, the 2 gallon/7.5L Air-Pots fit perfectly into a standard 5 gallon bucket, and for larger capacity pots use the 2.39 gallon/9L Air-Pots.