I agree with Lucky. My bike is a terrible starter thanks to some carb problems. When I had the acid battery it would occasionally run out of juice to turn the motor over hard enough. Since I've had my gel, no matter how long it takes the bike to get started, it always turns over well.
Just so you don't come to believe everybody likes them, I don't use them. In difficult applications we tried them at the plant, and didn't think they were any better than regular wet cell batteries, just more costly. Our local Interstate distributor also told me (when I was exchanging them for HD batteries) that many people have been disappointed with the claims for the gels and stopped buying them. Based on that, I don't use them in my vehicles. I'm not saying they aren't a little better, or as good, but for the extra money? Not me.
I don't have a gell cell battery, but a friend put one in his dodge truck a couple of years ago. He told me that it cranked his engine over a lot faster when the temp got down to 40 below zero. I believe that he got a much better guarantee than they give on acid batteries. I'll be buying one for my next battery. My last acid battery cost me $90 from the Honda dealer and it came with a 90 day guarantee, At least it is a sealed battery so I don't have to worry about overflows or acid fumes.
Big advantage of gel batteries is that they are plug-and-play. With a flooded lead acid battery you have to form it yourself. That is: Add acid, wait over an hour, then chage it at no more than 1.5 amps for several hours, let it rest for an hour, check voltage,If below 12.72v charge for four more hours, then install. If you don't follow this procedure the battery will have a diminished power and capacity and not last long. That's a lot of hassle and may be worth the extra $$$ to some people.
I was running low on funds so I got a cheap flooded this time. Next time will get a gel. Had a gel battery in my mustang in Phoenix, and that thing did much better in the heat. Hopefully I get similar results in the cold.