The soundstage becomes VERY "front" due to tweeters being positioned so far down the A-pillar. I run a +2 front with stock rear speakers and swapped fronts for the Focals. I normally don't mind sound a tad bit infront of me but in this car it's too far forward and too much of highs/voices since the tweeters do handle a rather large frequency range (lower than tweeters do in 3-way kits by thousands of hz) so myeaaaah....
You don't need to go full 100% front if you only swap front speakers. Rear can do a bit off fill and keep the soundstage "around" the seats still without ruining the sound. The speaker upgrade is ALWAYS worth it though. Sounds excellent when stationary and of course only so-so when driving at highway speed but you get alot better sound at higher volume.
Stock speakers go bonkbonk-base and muddy at 38-40 volume whereas aftermarket easily handles 50 volume and more depending on EQ and which speakers. And it's needed for highway driving if you want to hear anything except hisses and a little bit of bass