Negatives:
- The wallet is very small, therefore easy to mis-place, lose, or have stolen if left around
- It's electronic, so it is vulnerable to a battery wearing out or exposure to water and other elements
If stolen, can it be cracked or are the balances lost forever (if the owner doesn't have the private key held elsewhere)?
1: has seed words
2: can replace with a new unit for seed words (pretty sure battery shouldn't matter as only powered when connected via usb)
If stolen it would need someone to bruteforce the code manually, would take some time. You should be able to enter the seedwords and get the funds out before it happens.