I have tried several brands from a local hydroponics shop. They all seem to work OK. My main problem is lower humidity and not so great wicking. I can't really go a week between watering, even in a growing room with an evaporative cooler and 60%-80% humidity.
All the brands I tried have over 50% pieces that float. They are more prone to jump out of the pot when I fill it to the rim.
They are fairly irregular in size, as well. That is less than ideal, since you get less air space with a mixture of particle sizes. But my plants still seem to be doing fine. Maybe the irregular particle size would be a problem in an extremely high humidity area, but maybe not.
I am paying around $35 for a 30-50 liter bag of the stuff.
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