Say you have engineering and you macro the on-use with dance. You dance with +2801 agil. 30 seconds later during no dance you use gloves for +1920 agil.
If you have gloves and proc you get +1920 agil dance. The proc trinket will proc in your opener 8 times out of 10 which gives you an extra +3954 agil. (thug cleaves and RMPs rejoice) The proc trinket procs 3954 agil once a minute after that and has a chance to proc during glove enhanced dances.
It's really up to you though. The argument could be made in the past that you could be sitting in roots or kited during the proc but with throw rogues you will always be doing decent damage so the proc isn't really going to waste. Your opener will be just as strong if not stronger with the proc trinket. Don't know how good the rocket gloves are this expansion but you could use those and the on-use trinket. To me, woundman, reckful, etc. an extra 1000 agil in between dances is hard to pass up for the control of the on-use trinket I guess.