When my former employer, Global Crossing [now part of Level(3)] built what ended up being the final OPS site in Boston, a Norstar key system was selected.
Whoever did the install used BIX.
The cross-connects were unruly and block labeling/color coding nonexistent.
True, that can be "blamed" on the installer(s), but it made for a huge headache trying to figure out what went where after the fact.
66 block wiring can also look like pile of spaghetti, but, the larger spacing between the pairs make working with wiring easier (to me anyways) than Krone, 110 or BIX.
But, as they say, YMMV.
