The bigger cockpit provides ample room up front and adequate but firmly upholstered, rather upright seats in the rear. Conveniences include behind-backrest stowage for the wind-blocker, and a pushbutton facility for lifting the folded roof on its faintly quaking frame, which (slightly) eases access to 220 litres of roof-down boot space. There are gusting neck-warmers too, and a very effective noise-quelling headliner.
Steering is the 435i’s big trouble, however. Roof up or down, this BMW always feels like it’s burdened with a mildly destabilising load. There’s a faint waywardness at work, and the BMW's steering remains vague until you’ve turned decisively into a bend. Between them, these flaws are frustrating to say the least.
Should I buy one?
BMW will have wanted to give the 4-series convertible just as much dynamic polish as the coupé. Unfortunately, the result falls wide of the mark. Steering and roof-down body shimmy flaws on their own might not be big problems, but together they add up to turn this into a slightly disappointing sports convertible, despite its stylish advantages.
BMW 435i Luxury Convertible automatic
Price £46,520; 0-62mph 5.5sec; Top speed 155mph; Economy 34.9mpg (combined); CO2 176g/km Kerb weight 1740kg ; Engine 6 cyls in line, 2929cc, turbo, petrol; Power 302bhp at 5800-6000rpm; Torque 295lb ft at 1200-5000rpm; Gearbox 8-spd automatic