I agree with you all... on an intellectual level. My issue is that MRT Performance in Sydney recommends the use of a turbo timer on all GC8 WRX's, one of which I own. MRT particularly recommends a timer where inlet and exhaust upgrade have been made and where the computer has been re-mapped (me again). MRT are not a backyard operation. I called them yesterday and they pretty much echoed the "Nine times out of ten you'll be right but where these turbos fail it is usually as a result of coking."
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So while I understand and agree with the argument you're all making, I'll keep the TT. Even if it is, as has so cutely been pointed out, to "impress people" (seriosuly).