I just went on a 4k mile road trip with my brother in law, he drives a 2008 legacy. their halogen projector housings look identical to the 11' wrxs, if not really really similar. he installed some 35 watt 6k hids into his. I was usually leading the pack but we had plenty of scenarios where we'd drive past one another facing opposite directions etc and I was never once blinded by his setup, nor did I see any other driver on the road flash their high beams or anything.
not advocating one way or the other but I really think in a lot of modern halogen projectors, these cheap hid kits work decently. his cut off is really clean, too, you can see the lines of the light very precisely, unlike the other pictures that are shared here.