I do own an Ekich. Not all spools work on it as it needs to catch on the ribs of a spool and some don't have the "rib" that its little spike need to catch on. You can use a plastic insert to overcome this. Also unlike the Nor Bobbins that I use most of the time, you do need to occasionally release the tension on the spool by pulling the spool away from the bobbin and letting it unwind.
Otherwise, the bobbin itself is really nice to work with, feels great in the hand and nice to tie with. I notice on their site there is a new model in their line.