The 'only' problem with dwc (and I love it, but use modified res' w drains) is every week you have to dump the res and refill it...Now I have so many tubs that I prepare one with fresh nutes and then lift the whole plant/tub top/and rootball all at once and transfer it...I got tired of toting/buying water so I bought rodi unit and installed drains in tubs.
Now every week I just prepare nutes in a main res and push up the drain(common sink drain installed in bottom of tub) from the bottom, then I dump nutes into res thru extra hole in top...this alleviates about 65% of the work in dwc...

If I recall correctly, Zandor drips because he clains to be anal (hey, I'm just quoting Z) about having total control over his babies and wants to be able to add anything to his plants at anytime and drip provides for easier control,..after I do a quick aero grow in my big unit, I am going total drip from veg to flower...call me a copycat///roflmao...although I am growing some big motha's in dwc

On rootball problem, be careful not to cut the taproot, if you trim back...

By the way...If I built a pvc system, Instead of using just straight pvc I would put netpot in the bottom of T's and connect them :thumbsup: ...this would allow the roots to hang in the downspout of the t and also act as a drain for each plant, totally eliminating stagnent or pooling water/nutes
hope this shines some more light on the subject...lw