I have had my SQ on 21's since November 1st, and have to say I don't notice a massive difference compared to some of the other cars I have owned. I have to say it seems to come down to personal preference, and whether you can justify the price. I do think they look great too. I was actually sitting in traffic the other day having a conversation with the guy next to me in grey SQ5, and he said he wished he'd gone for the 21s.
I had an A4 TDI Quattro Black Edition before the SQ and it literally had every option going, including 19' rims on low profile tyres. It banged and clattered like hell on my wonderful Cheshire roads, the SQ is much better IMO.
Worst car I had for banging and crashing around on bumpy, uneven roads was my 335d M Sport. Stiff as hell M Sport suspension on run flat tyres.....BMW recalled a load of the wheels as they were cracking as a result. Simply awful! The SQ is positively Rolls-Royce-esque in comparison.
