15th overall: ~1050
30th + 56th: ~960
Value is pretty close. If this was the 7th rounder, I might have liked to squeeze out an extra 4th.
I have no problem with the trade. You picked up an extra pick and it probably had 90 points of value to you to do so.
Suggestion, I think there should be a trade approval person for anything that leaves, say a 5% gap or more, but just my opinion, for the 7 rounder.