Reply to Behringer DDM 4000 vs a custom built midi controller

I've been looking into building my own midi controller (UMC32 or similar) recently. When you spec all the parts it turns into quite an expensive project - particularly if you want something that gives you a similar experience to the VCI-100.

Now, looking at the DDM 4000, it seems that this mixer would more than cover my midi needs. It's missing two jog wheels but that's nothing two EKS XP5's wouldn't fix.

So... what are the pros and cons?