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First, the difference in diameter is big, especially the rear. I haven't had a chance to test them on any turns, but I drove over some uneven street road and can already tell a diffence . Although I didn't install them myself because I don't have the space to do, my mechanic friend didn't have any issues and the install is maybe an hour with any type of power tools. Also drained and refilled with Castro synthetic oil. $60 total.
It was night and day for me also. Not quite on rails but good enough. Going to throw on my coilovers tomorrow, hoping for even better handling, though I don't expect it to feel like the way my is300 did.
i do think my shocks need changing as I feel a little more bobing up/down on the highway. i'll wait a few thousand more miles though. good luck witht he coils.
I'll be converting to Megan coil overs in the near future. I'd rather have the adjustablity of coil overs than just replacing the shocks and springs separate.