I did try the e53 4.8is and although I fell in love with the handling & cornering, I found it very sensitive to anything that's not perfectly flat, probably due to its very stiff suspension ...also, the E53 4.8iS is ~ $12k more expensive than the 4.4i, so I'm wondering if the extra 40HP is worth it...now, price-wise, the 2006 e53 4.8is and the 2007 e70 3.0 are at par