It's nice, but one missing feature.
Where are the cheap chinese knock-off refills?
A thing like this is a long-term investment. That means I'd want to see many manufacturers competing to provide the resin. This isn't just to drive down prices, but also an assurance that even of the manufacturer goes bankrupt in a few years or shuts down production of resin in order to drive people to a newer successor product there will still be a supply of refills.