For me this is one of the best plug-ins for acrobat - a must-have for anyone in th prepress business! I use it since more than 2 years. It is very flexible and stable and powerful - especially for this low price.
And you can not only use it for imposing issues (creating booklets, n-Up pages, step and repeat), but also for everything what is related with pages in a acrobat document (trim and shift fo example - much better than in acrobat itself, add page numbers or text to pages, sort pages, rverse pages, join pages).
It is quite easy to use - when you know what you want and what you have to do (you should have at least basic knowledges of imposition)! You can even realize complex imposing tasks (including shifting the contents of each page for booklet folding - "creep", large imposition formats, ...) - but the plug-ins doesn't help you much to plan the imposition scheme - you have to plan it before including all measurements. In complex cases, perhaps you first have to built a masterpage with additional page items you wish to have (for example color bars, special registration marks, ...) in an external program (illustrator, freehand, ...) and use it as a background-PDF for the imposition process.
So it is good for everyone who often has to make simple or medium complex imposition tasks and not so often more complex imposition tasks - it works but it takes perhaps to long in complex cases.