The GrimmSpeed AOS has done very well keeping the TMIC clean as a whistle, however, there have been concerns about the GS AOS and hard cornering. I'd like to participate in a few autox events this year and possible a track day as well.
I'm disappointed in GrimmSpeed's response to this thread on another popular Subaru forum.
I have just ordered the Crawford and should have in a week or so. I'll be sure and post up my impressions of a rather pricey, but by all accounts a top notch system for the enthusiast. I haven't installed anything new recently - the mod bug never stops biting.