I too have a Sport II which I bought because they were reasonably priced.
I had a an early model MOE with the chrome lined barrel and it was a very good rifle. I traded it for a POF Puritan piston with premium parts already in place and it has been an excellent rifle, reliable and accurate.
I bought the SportII because it is reasonably priced, DI, a little lighter than my POF and I had some stuff left over from my previous Smith. It was a simple project to swap out the bolt for the WMD bolt from my MOE and buy the FDE Magpul furniture, hand guard, stock and grip as a package and put a red dot (SightMark) also in my parts box. The cost was less than buying an upgraded model which, because I have an upgraded POF, I really didn't need. I am very pleased with both of my AR style rifles. Both are reliable, accurate.
Now, maybe my reasons are different than some because I just wanted a 'back up' rifle and the Sport II filled my want, but adding the Magpul furniture was an option, the bolt I had and the same for the red dot. It is very easy to get carried away buying things for one, so it does help to do some research and shoot it first so you have a good idea of what you really need vs what a gun store commando tells you. The Sport is an excellent value as is, but it is easy to get carried away a some have posted.