I did that setup once and noticed a huge difference. It was great. Only one problem though which has been reported by a few other users as well. The drivers side bushing for the front swaybar provided by Eibach was too big. It allowed excess movement of the bar up and down creating a clunking noise over bumps. I ended up replacing it with the H&R 24mm front bar. Coupled with the 25mm rear Eibach bar its perfect. There were no problems with the rear bar. Just the one thing I would caution you about.
well it is installed and I LOVE IT!!!!...i don't get any clinking noise what so ever...now all i need is some good rims and then i will be done with all the handling part of my car and then i can start doing engine work....YAY!!!! [headbang] [woot][ffrocks] [loveff]
And as far as your question about it dialing back in some understeer with the bigger front bar yeah it did a bit. But I honestly didn't like it that much with the big bar in front with the smaller in the rear. Just felt like the rear was too wild at times... The H&R really calmed it down a bit.