This is my second winter with Kreiter 3" alloy rollers. For me, there's enough resistance as is. At this time I'm doing intervals as ride 1 mile spinning 90 in 50/18 (~20 mph), rest 90 seconds 75 rpm down 2 cogs, no hands (sitting straight up) to give my butt a break. Repeat 6 times with warm up and cool down, 10 miles, ~35 minutes, that's enough for me. Garmin 520 tracks the intervals.

Tires (GP4000, 120 psi) polish up nice and smooth but no wear or rubber under the rollers. (Ironically, I've had 2 flats so far...any FOD on the tire will compromise the tube)

I am very happy with the Kreiter 3" rollers and got a good deal at Colorado Cyclist (390ish if I remember correctly)