I tried them in my 07 sdi. The mag side stopped working one night. Put a used set of normal plugs in and it was good to go. I use them in my trucks without issue. Not sure what happened to it in the sled. Only had 300 miles or so on it so I assumed it was just fouled.
I put them in our 08 600 sdi summit and 08 550f freestyle. Both sleds idle more smoothly than before and start faster... Especially at cold temps. Especially huge improvements in the idle on the 550f! So I think they're worth it. Now with an etec maybe not so much because they idle and start so smooth anyway.
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