I've seen it discussed a lot but recall little actual completion of this type of trade. The problem is there is a lot of risk, both parties need to have absolute trust in the other. And both need to have something the other wants desperately and can't get at the 7 month window. IMO, this would limit the issue to certain times at BCV, BWV, VWL and summer in HH. Possibly for 3 BR at OKW, VB and SSR as well.
What I could see more would be an asynchronous swap. Say person A gives person B 300 points at OKW and person B reserves say a BWV BW view unit for 270 points. Think the difference in resale value.