Purchased a HP 16 GB full metal pendrive when I brought a new phone in Feb 2015 for using it as an OTG. Its been 3 years now, and I’m using it as if I brought it yesterday. The full metal body protects it from external damages. Once it had fallen into some water, but I had quickly dried it off under a light bulb. Woop! back to life and its doing great again.
Pros:
Extremely long lasting.
No worry of external damages, breaking etc.
Small and friendly.
Cons:
Metal body gets heated up if ysed for long time.
Not water resistant.