There is at least one other thread like this, about 6 or so months ago?
KX2 vote here.
FWIW, I took my KX3 on 5 day backpacking trip in 2015, great but purchased KX2 when they came out and took on 7 day backpacking trip in 2016, very sweet, smaller, lighter, soon sold the KX3. Took KX2 on 8 day backpacking trip in 2017. Love this rig so much.
Also a few other short outings. No issues.
As another posted, robustness issues have been “feelings” only, no facts to back these assumptions. Love mine and highly recommend!
Mark / K6MTS