It is surprising how much the Master Pro kits cost, but when the contents are taken individually it would probably cost even more to put it together. So therefore i think they are a good buy.
Personally i like to build my own kits, much more fun <img src="images/graemlins/cool.gif" alt="" /> But also by building your own you can make a much more complete kit with everything you need. But building your own can be time consuming too.
In the end it's your choice