Blumat drip sensor

hi guys I was wondering if any one has heard of or even used the Trof BluMat it is very impressive, and available for $20 for 10, thats 10 individual sensors and drippers for 10 pots. all need is sensor, a pot, and a reservoir. I am very curious about these I have even heard that they work great in coco, or other similar hydro mediums. in my area they are not available yet but I have asked around at the hydro stores and they are now interested too, so soon I will be playing with with them. here is a link let me know what you guys think, I have never seen anything like this I think it might be revolutionary for all the soil and organic growers. it is mixing auto feed with soil which till now is kind of hard and not to accurate.

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