I have worn these boots everyday to work for the last 7 months.  I work outdoors and often do strenuous tasks on steep uneven surfaces, etc. and they're still in great shape (no problems with detaching sole like another reviewer).  I've worn them in temps ranging from 30F all the way to 100F, and with the appropriate socks, they have done well whether it's hot or cold.  I'm really surprised at how well they ventilate when it's hot out!  They're not the most ideal for wet conditions, but not terrible either.  Traction is good.  4 stars because ankle support could be significantly better (although keep in mind, they are a low boot and my opinion stems from climbing steep slopes - if you won't be climbing anything steep this may not be an issue for you). This is of course a matter of personal preference, but I would love to see a pop of color somewhere on them.

Sizing:  I range from 9-9.5 in most shoes.  In Keen footwear I'm always a 9.5 and these were no different.  Great roomy toe box and fairly comfortable insole (thinking about switching out to one with a bit more cushioning).