Make sure you consider the whole package, not just the price.  We had a Multicam Digital Express.  We bought it because of the price.  However, the software that runs it is definitely lacking, and the tool setup takes a lot of time.  But you get what you pay for.  We upgraded to a Zund--  the software that runs it alone is worth the price.  Anyone can run it with just a couple of moments of instruction.  It really is a night and day difference.  So as I say, make sure you check the whole package and see how it works, how you change tools, how you calibrate, everything prior to purchasing.