I think the video I linked in the post would demonstrate the benefits better than me writing here. I agree that the look of Portal 2 has long-lasting appeal, but P2CE introduces improved lighting and graphics rendering inspired by Source 2 while still being Source 1. Otherwise, the improvements are mainly technical, like removing signature “Source spaghetti” engine limitations.

The real killer feature is that it reorganizes Portal 2 under the hood to be very mod- and custom campaign-friendly, so it will be the Portal enthusiast’s dream platform.