I've had a lot of experience with VDJ, and it's brilliant, depending on what you'd like to use it for. To create music from scratch, this isn't the software you're looking for. Maybe invest in FL Studio 11 or something, but don't compare software such as that to this. They're both made for different uses.
With VDJ there are many different things you are capable of doing, I tend to use it to edit pitch/key/bass/filter etc, whereas software like FL Studio is to create music completely from scratch, and is a lot harder to use.
VDJ is very easy to use, it took me under an hour to be able to do all of the basic things, and now I've pretty much discovered all of it's features, and there are many.
However, if you are considering buying VDJ 7, go to the official website and buy a subscription to VDJ 8 or download the home version there. I've used VDJ 8 a lot lately off-steam and it has a lot more useful features and is a lot more up-to-date.
That's all, I highly recommend you buy this if you will use it for the reasons above.