I'm running a top fed dwc. 5 tanks. 5 plants each with plenty of room to flatten out and grow upwards. Checking on the plants is easy and quick. System maintenance is cake.
changing out 5 tanks of water (approx 25 gallons)
total time: 2 1/2 hours.
Draw the 5 gal
let it sit 24 hours
add your junk (nutes and supps) and PH 5 mins per tank
drain res, fill res. 10 mins per tank or so.
then you're good to go for 7-10 days, keep an eye on your temps (water and air) and add just ph'd water to top off if they're looking low.