Hi emriga and welcome to the forum
TBH I can't say that I have ever heard of Aist or their software. At £800 it is a high cost option in the same league as Adobe Premiere or Sony Vegus Video which are both well known and highly regarded.
What features are you after? I'm sure one of the above packages would do all you require.
I have checked the software review listing of 'Computer Video Editing' mag and they have never reviewed (or at least don't list) anything by Aist and they do normally review all the latest, good software for video editing.
Take a look at their web site and perhaps even ask the industry experts (and amateurs) on a dedicated NLE forum. It can be found at
www.computervideo.net
Mark.