Any of the name brands are good. The new Vortex warmers with digital adjustment are cool, but now I’m using woodcraft’s which I really like because of the auto shut off feature. Low temp is useful for racing mainly, but if you’re at a trackday and want to keep your tires on low before lunch because you’re going right out after then it’s useful. Single temp I wouldn’t like because you’re stuck with no options. I pretty much keep my tires warmed on low or high at all times during the day lately, only turn off if It’s going to be more than 1-1.5 hours between riding. Better to not heat cycle
^This. Except for 1-1.5 hours is nothing. I've heard people talk about "baking" a tire while leaving the warmers on, but I haven't experienced any of that and during race weekends I often leave mine on high for like 3 hours straight. They're nice and hot for my next race then
I like the dual-temp Woodcrafts, but honestly I only use the low setting like 5% of the time maybe. If there is time I'll use the low setting on rain tires. I know it's not needed, and by the end of the warm-up lap they're probably at the same temp as without the warmers, but it gives me more confidence. I guess it's a mental thing...maybe that's why so far I've always had good pace in the rain lol
Other than that I'll sometimes use the low setting if it's really cold in the morning (like in the 40s). I don't want to "shock" the rubber too much and heat it too fast, so I'll put them on low for about half an hour and then turn it to high, so the temperature ramp rate is a bit slower.
2007 ZZR600 (sold)
2006 CBR600 (sold)
2010 1198 (parted out across North America)
2013 CBR500R (sold)
2009 ZX6R (parted out across North America)
2015 R3 (race bike)
April 2016 and April 2017 6OTM winner!