We've been bitten by the old/new software version thing too phestus..... All the better reason to keep all of your systems on the latest software revisions when they come out. We include that in our service plans, and for others, we call every quarter or so and recommend a software upgrade if it's available. Sometimes we'll offer a discount rate just to get on site and update. Usually other issues or sales come of the call.

That is definitely a shortcoming, but I wouldn't go as far as calling them poorly engineered, honestly there are few other systems on the market that allow you to migrate up through all of the system sizes (accept for the legacy S-Class) and still keep phones, port cards, etc.

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