I think Opskill academic writing script is running the market. They have great features.
Opskill's ecommerce script is to another level. Its is very easy to use and customize.
I love the hosting company I can easily reach. Their site maiantainance also good, I love it
Their script is fast and runs minus any major bugs. Also extendable makes them very good
Oskill script runs in my 68 websites and its great. Easy to install and use.