Semi happy. I find the cartridges 1/5 leak which makes a very unpleasant taste. Also I find it unbelievable that Boots stores are out of refills ,to the extent there’s no stock in their warehouse. Therefore I had to order mint refills directly from yourselves, which incurred a postal charge. When I said to the lady who took my order, you should inform your sales director , Boots , hardly a small retailer are out of stock of epen refills. She didn’t seem to respond ,as I would have expected ie I’m on it. However, maybe Boots are not paying their bills on time.