Default [Q] Would the Go make a good backup phone?

I'm currently an Xperia Z1 owner and have been thinking about getting a decent backup phone in the case I lose or break (or brick) my phone. I'm notorious for breaking and physically wearing things out (I call it a gift) and think its important to invest in a decent backup/active phone (something I can take hiking or long bike rides). Seems like the Xperia Go (about $180 on ebay) would serve this function perfectly.
Main question: is this device as durable as advertised? Are there any significant issues I should be aware of that may sway my opinion?

In terms of what's important to me:
Durability (Brick like durability) and Reliability (just needs to work well as a phone) are the most important. It will likely have a few hours of use a year unless I break or lose something. Thanks for any input I receive.