Hydrofarm net cups are great quality. The many holes in the bottom of these cups promote healthy roots with even drainage. Letting the roots grow their own way, right down through the pot, allows for bigger, healthier roots. These cups work with any kind of media -- hydroponics or soil-based. They're also easier to clean, since water runs right through the holes.
They have a comfortably-sized lip along the top of these containers, making them easy to grab, lift, and transport.