I recently just did this with my 2011 wrx limited. I lost quite a bit on depreciation due to an accident but.. I do not regret it a single bit! I absolutely love the STi, it fixed all the problems I had with my WRX. I even feel like the plastics are softer touch (even though this is probably only because its new). The STi is a completely different car, modding my wrx would have still left me with a wrx. The car simply feels like it is of better quality, my speakers in the STi sound much better than the WRX did also, not sure how the Stock HU is better than the nav I had in my wrx but there you have it. If you can afford it, go for it.