I can say about your comment only one: manipulative comment! Joomla is a huge community, there is simply no chance that any extension work in combination with each other and with each template.
You never asking us for support and is very simple to write: "I do not have time to search where is the problem". I am sure that you use the earlier free version of component. All known bugs are cleared from the paid version.
What on earth are you talking about?
There is option to enable ot disable ajax cart - with intelligent scanning of user behaviour so if user tries to add products to the cart with missing choices an additional ajax window opens and asks for the user input.
Order page is completely customizable through the extensive templating system - you can do it 100% however you like it.
If you cant see nothing special you clearly did not work with many different webshops - Ive been developing webshops for 12 years and have worked with everything there is and trust me there is nothing out there on this level _nothing_.
The feature list of features you will not find in any other "off the shelf" system is big and every single day more and more features go in.
So your review is completely unwarrented and to be honest factually wrong - if you would atleast have spent enough time with it to check the configuration for ajax options etc. i am sure that would have helped, but it seems you didnt - what i guess is your loss.