After playing the HD version, I must say that it looks and plays phenomenally, and definitely stands the test of time. The only thing the game could really benefit from is some improved surround-sound effects, but it still sounded perfect otherwise. Graphically the HD version is a nice overhaul of the original, it still looks nearly identical in appearance (ie, no funky changes with the improved graphics, they just look much sharper in HD and include widescreen action)
It was also nice to see my REZ skills still remained intact, in fact i didnt even get hit once till the 3rd boss fight. Alas passing the 3rd level was all I had time for at lunch, but tonight I will return and finish the rezt of the game.
If you've never played REZ, grab this game immediately. If you have, then be happy to know this version is superb, and definitely worth re-visiting.