Yes it can be a little soft at the long end. But at this price point it's hard to complain. Especially in order to get a much sharper photo at over 250mm you are looking at 3 or more times the price!
Yes I like the value one gets for this little gem, just like the nifty fifty. I like carrying it whenever I go hiking compared to the 70-200 f4 L. Of course there is no comparison in quality but for landscapes and your endurance it is a very good bargain.