Ive also driven the Sti - Optioned with the a few different things here in Tokyo.
I own an Sti Forester so i wanted to compare horses with horses...
I really liked it and i disagree with some of O.P's comments. Owning an Sti is very different to owning a Skyline - different animals. Especially when youre comparing a 12 year old R33 to a brand new, technically laden WRX.
The SI drive was interesting and although a little gimmicky, its really only throttle and engine mapping - It has fly by wire throttle and only 4 settings. Economy, Normal, Sport and Sport #
In economy it really does feel like its having trouble breathing - lacking any urge. It was in this mode that the guy from Subaru placed it in and i wasnt aware of it so as i was driving i was thinking - what is wrong with this thing? It wasnt until i tried the Sport setting that things changed and i mean drastically.
It picked up so much more urge and around 3,500 rpm started pulling very hard losing a little steam towards 8000 rpm.
It really came across as a little feral. The Forester is a 2.5 and achieves peak power at 6500rpm and peak torque even as low as 5800rpm. Theres no need to visit the 7000rpm limit because of the extra grunt and taller gearing. The WRX on the other hand was peakier, called to be revved harder and in turn felt more involving but a little raspy and manic. It also sounded really good in the upper part of the rev range.
In Sport# it was even better - the engine and throttle mapping giving the engine its richest mixture and you certainly can notice it, power wise.
Price wise, the base grade WRX is around 32k in Japan and with all the fruit including the recaros which are a 4k option and the navigation system which is another 2k, youre up around the 43k mark..which by the sounds of it is much better value here than there.