The 5x's had some serious issues leading to bootlooping for lots of users. You could get it repaired by LG (often free, even after warranty), but you'd still be out a phone for about 10 days and it came back wiped (IIRC), and then you're still going to worry about it.

I'd consider another Google phone, but I just don't trust them to have designed and implemented a phone that's going to last as long as a phone of that price should last. From the latest round of phones though, motorola seems good enough, except the vibration is very hard to miss unless it's on a table; nokia has bluetooth problems with one of my cars and isn't pushing a fix worldwide, even though some countries have had the fix for months; ugh.