Dan212222,
Check out the feedback before buying, I had a quick look and personally wouldn't touch it. The second neutral feedback looks worrying, click on the item it's Adobe CS2 for buy it now £10.00 and described as an order error from Adobe, call me old fashioned but this screams buyer beware to me!
He has also just reregistered with ebay(check id history) I've been burnt twice on ebay and have lost confidence in it.
With regards the various modules it really depends on what type of work you want to do. I'd say AR is a must though.
Good luck
Lsphotog