Honestly, the largest thing (to me) that is missing from hardware wallets is the number of coins that are supported. When I was considering buying my first hardware wallet, none of them supported enough coins that I wanted to keep offline. If you could find a way to support 20 - 25 different coins, that would definitely make me a buyer. Of course that is probably a huge undertaking, but it's what I personally was looking for in a wallet.
Thank you for your feedback!
Our current prototype has adaptability to 12 different Coins. We are working everyday to make more possible. There is an extensive process in the research of the coin, it's developers, and the economy before it is approved by our staff. Do you have certain ones in mind? Unfortunately I cannot disclose the current supported coin but would love to know the ones we hit on your list!