1st Generation Keystation PRO 88 compared to oxygen 88?

I just got one in great working condition for 140$ and a drive. It's known as the first hammer action midi controller and feels pretty darn awesome.
 
Its huge, heavy, and dirty. How does it compare to the Oxygen 88? This thing weighs at least 40lbs lol. I'm wondering if i should try to sell it to increase my budget for a new oxygen 88. 
 
Or should i stop thinking "the grass is always greener on the other side" and just play it until the old fella dies an honorable death?
 
Also any other differences between the 2 88's would be appreciated.