I really like hearing about real-world usage and lessons learnt. Christopher Davey's paper from an INCOSE 2013 (USA) MBSE Workshop on Jan 26-28th is interesting. It talks about Automotive MBSE at Ford (EE Systems). The PDF is on the OMG Wiki.
"These forcing functions lead to the need to support a HYBRID MBSE environment that
consists of a set of modelling tools with associated style guides, maturity levels,
completeness levels" (p33) is what I took away; particularly when it comes to reconciling the different worlds of PLM BOM-centric vs SysML/UML/Software is-the-future ;-)