Eviscerare|joker|'s got a favorable review up on its predecessor: http://theheadphonelist.com/headphone_review/beyerdynamic-dtx-71-ie/
The 72 iE is actually a new product. One would think they've only improved things. Beyer's only recently dove into the IEM business so it's not that surprising that reviews are sparse. Maybe some members that have heard it will be able to chime in.