I haven't YET...but I would recommend getting winter tires. Even in 2 inches, the Speeds are terrible in the snow (imo). I work at a local Mazda Dealership, and we park the Speed's, Miata's, and Rx8's under the awning out front so we don't have the move them at all when the snow plows come through. They are the most difficult to get moving. When I bought my '07 I was going 20mph down a hill that was curved. There was only an inch on the ground...the car wouldn't turn and so I ran into Accent rocks in front of a house....It only had 700 miles on it. Very sad day. OR I'd just get 16in, wheels and tires from someone with an I Model Mazda3 (09 or older). They'll fit.
PS--Although you probably already have...did you get a CARFAX? Though they don't show every little detail, it's still a nice resource.