I have the mulchers, they are alright, i only had a couple of runs on them so i didnt really compare how well it grips compared to my stock tyres. but they dont really grip well on very lose dirt, but then again what does when you just hold the trigger down all the time. they weigh 0.8kgs = 1.76 pounds for all 4 tyres and foams. My stock maxx tyres weigh 1.12kgs = 2.47 pounds for all 4. So they are alot lighter.