Scott,
I owned a Sony SXRD rear projection set, which suffered from what seems to have been an all-pervading problem for Sony's RPTV sets - degradation of the blue light path over time (~8000 hours) which leads to a greening or yellowing of the picture. The problem was so prevalent that it resulted in a successfully settled class action lawsuit (see http://sites.google.com/site/sonylcdrptvproblems/ for very detailed info) as well as a semi-secret replacement program (in which I received my current Sony flat panel LCD for about 75% off of MSRP).
I am curious if Sony's front projectors have had the same issues, or whether Sony mitigated heat damage and dust intrusion in some manner which was more effective than in their rear-pro sets.