A colleague/friend of mine, and member of CB, is incensed that ETC changed the field angle of the 436 between 11/2001 (Cut sheet Revision C) and 12/2007 (Cut sheet Revision F--current). [user]STEVETERRY[/user] has previously <stated/admitted/disclosed/confessed/boasted> that there have been many changes to the SourceFour fixtures since 1992, and most are minor and not apparent to the consumer. Has anyone ever had a genuine problem mixing older and newer fixtures? He is particularly angry at ETC for not making a more public notice. (I did point out to him that all the cut sheets include the phrase "All product information and specifications subject to change.", but that didn't seem to comfort him. Do you think a manufacturer has an obligation to inform the consumer when a relatively minor specification has changed?