I love it. I get the Blu-Ray copy for my TV and the portable copy for my iPod. Works out great, and it doesn't seem to be an extra charge. The Blu-Rays that have had them seem to cost as much as (or less than) editions without them. I've purchased Rambo, Jumper, and The Bank Job and all are priced like regular Blu-Rays.
Although I don't mind the digital copies just to have on my PC, I need a different format for my PSP to play them. Because of personal experience with protected WMA files, I can only hope the WMV won't become the same headache - but I at least have the movie on disc in the case of the DVD or BluRay with Digital copies. It is nice to have the movie on my PC's hard drive. I understand the appeal completely.
With the WMA (protected audio files) I legally purchased from MusicMatch Store, after replacing a dead hard drive and installing Windows, I am completely locked out of ever playing these files again because MusicMatch Store was acquired by Yahoo, and I no longer know my login info for MusicMatch. In my last attempt to regain access to them, Windows Media Player completely failed to find any information to link the WMA files to. It didn't even recognize MusicMatch or Yahoo as the source anymore. Fortunately, I made CDs and I can rip those. One reason I buy online music from Amazon only now.
I keep the codes for the digital copies in the DVD case. Thanks to protected WMA files, these digital copies are not a selling point for me. I just care about the movie itself. Again, the digital copy is nice, but I have to wonder if there will be another set of headaches in the future. Is there a limit to how often the code can be entered (now or in the future)? With some operating system upgrades and crashed drives, the code has to be entered each time. For example, I was using Windows XP until last week. I hated Vista. I love Windows 7 RC. You can't do a straight upgrade from XP to 7. It was another fresh install - removing XP first. (You can upgrade from Vista to 7 without Vista being removed first.) Entering in those codes again for those protected WMV files. Ugh...