Yeah yeah I know another 5 star review but these are very nice boots.  They are light, waterproof (up to over your foot but not much higher) and comfortable - with no break in period.  That said if your foot isn't like mine then they may be different for you, so here is my situation.  I measure out at a 9.5 US and I weigh 230 lbs.  I bought a 10.5 and that fits well.  They are roomy in the toes and provide good support.  My use is mostly on dirt trails, paved trails and when the weather is bad outside.  Actually, I wear them around a lot even to work and the store because they are comfortable.

I cant comment on their fitness for back country hiking because I haven't used them in that way.  But for day hikes they are awesome.