Yes, it's a good bike - but the DK Signal gives you more bang for the buck money-wise. The Signal has a freecoaster - STOCK - the Haro does not. The price for both bikes is very close, so why not get the one that gives you more stuff for your money?
Haro has come a long ways in the past couple of years, but the Master frame is still a hybrid street/flat frame and is not a true flatland specific frame yet. The DK Signal is the way to go unless you MUST buy from your local shop, in which case go with the M5 and deal with the loss of extras that you could have gotten for your money.