Anyone use a Wilma v2 dripper system?

Was thinking about getting a Wilma v2 dripper 4 pot xl system (18 litre pots) and using it with coco for my next grow.
Any one use them and what are your thoughts?
I'm looking something nice and easy to use that dosent cost an arm and a leg and something that will water them perfectly (so I only have to mix up new nutes every 3 or 4 days)



Thanks