I wish I had a kicker on my 19 Husqvarna 450 FX. I'm not sure it would help it start in the cold but sure couldn't hurt.
I just want to kick all these manufacturers in the nuts for taking the kicker off.
Mine cracks pretty slow to start. Eventually it cranks faster and usually will start, but lately I have just been skipping that and hooking the jump pack up. It cranks a lot faster with antigravity jump pack.
However, I don't trust it to start when the temp is below + 10 F and I transport it in the back of my truck an hour or two away (even with the jump pack). Here in Montana, below 10 is most of the time. I have to use my trailer just to make sure it will start.
One day I thought it would be warmer but it ended up being -15 at the parking lot. Even with jump pack, it wouldn't even think about firing up. Had to drag it into my buddy's heated trailer.