The benefit would be that drive manufacturer usually bundle the device with appropriate software, including a packet-writing MRW-capable application which will allow you to gain full benefit of MRW.
You will still need to format your media but the format will take only a few seconds instead of several minutes.
DVD+MRW are not yet available on the market. Still under development.
InCD Project Leader
Im Stoeckmaedle 18
fax: +49 (0)7248 928 299