I run a 275 front and just switch back to my 245 front for winter. It was remarkable how much lighter and more fluid it felt. There is no mistaking the grip from a wider front (though not as much as you would expect if sticking with the stock suspension), but I kind of miss that lighter feeling with more feedback. When the 275s wear out I will likely step down to a 255/275 combo.
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18