The "Pro" kit is actually just the Premium kit plus a few extra additions (an e-drum brain, a kick trigger pad, etc.) that you can use to turn the Premium kit into a real electronic drum kit usable outside of the games. This "Pro Upgrade" kit is not made or sold by Ion, but is a package put together by Sigler Music.
The only catch is that the extra additions they have are pretty low-quality, and I wouldn't recommend them to anybody.
If you're interested in the Ions, get the Premium kit. You can always add other things on later.
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