I use DVD-RAM. It is only moderately more expensive because I use fewer discs. It is used for data and video. There is nothing I am aware of only available on RAM and the odds are shrinking every day. No one in their right mind would distribute software this way to the public. This technology is not likely to become part of the daily life of computer users. Even though 16X capability has been developed, very few people would use it and as only 2 drive companies utilize it (one is leaving the optical market at year end) I don't see Panasonic carrying the torch. Word is their new home equipment is going to use RW.
So, it is fun, it is rock solid, it makes sense if you have DVD recording using it already, it is, without question, the most reliable long term storage available. 5X discs are now down to $7, the LG 4163B is the same price as NEC and Pioneer and performs as well on -R. So you decide. My guess is that in 2-3 years, it will be like the other Panasonic ideas that never quite made it. Remember the Superdisc LS-120? I am glad the media is rated to last as long as it does, in a few years I expect it to be very hard to find.