Ranked in these QuestionsQuestion Ranking
Pro Beautiful asthetic
The design of the credit-card like device looks sleek and aesthetically pleasing.
Pro Small credit-card size form factor
As of June 2017, this makes it one of the smallest hardware wallets out there with an LCD screen and rich pairing features with mobile phone device.
Con Partial transparency of software and hardware specifications
The company has stated on their FAQs page that they intent to release some of the software as open source, but keep other parts of the software and hardware design closed. They have stated they are open to allowing "trusted members of the community" to verify the integrity of these closed items. Ultimately, the inability for the whole community to review the integrity of the software and hardware means that you are, to some degree, putting your trust in this company to not do you wrong.
Con Only supports Bitcoin
Currently (June 2017) the device is only scheduled to support Bitcoin. Though the company has stated on their FAQs page that they will consider adding additional cryptocurrencies in the future.