Have you already got the di2 set? That RD is also called "hens teeth" as they tend to break, and unless you can find another one, the whole set is useless because it isnt compatible with other di2 generations. Some used ones went on ebay £400+ (edit: just checked, lately a few went for around £100 so I guess demand is gone)
If you havent already got it, I wouldnt buy into that generation of di2.
Have you already got the di2 set? That RD is also called "hens teeth" as they tend to break, and unless you can find another one, the whole set is useless because it isnt compatible with other di2 generations. Some used ones went on ebay £400+ (edit: just checked, lately a few went for around £100 so I guess demand is gone)
If you havent already got it, I wouldnt buy into that generation of di2.