I notice that the ISC gets dirty and I wonder if these should be replaced at regular intervals instead of waiting for them to fail. They do seem to fail, with a few threads on these forums about idle issues that turn out to be the ISC playing up. It must be the carbon, oil and hot/cold cycles that do them in. I'd guess the shaft gets sticky and the internals wear.
Not so much the TPS, as far as I can tell.

With my recent idle issue and ISC replacement I found that theres a number of ISC's for Magnas on the market with a wide range in prices from $130 up to $800.
I wonder if theres a preferred brand thats more reliable and longer lasting than others?
Do any of the mechanics here have a feel for this? What brand ISC's should we be looking at and what price is reasonable?

Or would those who have purchased a replacement ISC make any recommendation of any brand given their experience?