I have been running studded tires in winter for maybe 5-6 years now. Granted its on fat bikes on singletrack trails. Had Vee Snowshow XL 4.8" on couple hard tail fat bikes and now run 45Nrth Dillinger 4, almost 4" on my full suspension Salsa Bucksaw in the winter. As soon as the snow comes down I swap my wheelset from 27.5 with 3" tires to 26" x 4" winter fat wheels. The studs make a huge difference on icy trails. I just did 14 miles with 3 other riders which had varies tire sizes and no studs in 2.2, 2.8 and 3". Was anle to go much faster and no slipping issues on the south facing trails with sections of pure ice. I had instances in the past where I lost traction and crashed. Once a small jump at speed coming in to a corner which was icy. Wheels lost traction and bike got out from under me resulting in me slamming my side on to frozen ground at speed braking couple ribs. I definitely try to slow down and be more careful now. As to asphalt, not that great, I have about 1 mile from the house to the closest trailhead and riding the bike with these fat studded tires on asphalt is a pain. Its very loud and definitely effects rolling. No way I would go on longer asphalt ride. Now if you nwed nerrower tires like 2" or 2.2" studded, I guess it would be far easier to roll on asphalt.