Physical media, whether it's Blu-Ray, HD-DVD or some successor down the road isn't going anywhere. Online rentals aren't 1080p, don't have high definition 7.1 audio, and some are compressed and you can tell it. And besides, for those of us on slower connections, I can drive out to Blockbuster and back before I can download a movie.
Anyways, to the question at hand, I don't have either. But I wouldn't necessarily regret buying one. EAs long as it still works, and you have some HD-DVDs, you can still watch them. Besides, it's just that excuse you were looking for to get a PS3 😉
Now, if I bought an HD-DVD player and a bunch of HD-DVDs, and the player broke and I couldn't replace it, and I had all these movies I couldn't watch, yeah, I'd be pretty pissed