Rakesh

Hi All, First of all Sorry to hijack this thread as I couldn't find a better place to put my question. I am planning to buy BMW 3 saloon with below spec and need your precious advise as I do not want to end up paying £25k and regret the decision for next few years and have a broken back. Model: 320 d M Sport Condition: Used Year: Nov2014 Reg package: M Sport Package Wheels: Alloy 19" (Not RFT's) We took a short test ride(around 1 mile) last week and I really liked the car being in a driving seat but the back seat passengers complained that the ride was bumpy and could feel every inch of the road. During the test drive I was on sport mode so wondering whether that is the cause of firm ride ? Does anyone who own similar package shed some light on whether M sport package is fine in comfort mode and good for cruising on Motorway journeys ? Also most of the forums say optional adaptive suspension makes the ride more comfortable nut there are very less used cars in the market which has this option, so is it possible to change the suspension to adaptive by paying additional money or is that a factory default and is it wise to go down this route ? Thanks in Advance! Regards, Rakesh