I have two sets of 509 heated:
Kingpin Ignite
Aviator 2.0 Ignite S1
90% of the time I'm sweating while riding, so fog up very easy. I had the Kingpin's for a couple years, and only picked up the Aviator's at the end of the year last year due to a closeout deal. The Aviator's fog up way worse than the Kingpin's, since the Kingpin's have more venting. Actually had intentions of selling the Kingpins but have changed my mind and keep whatever I'm not wearing in my tunnel bag.
Kingpin Ignite:
Pros: More ventilation, less fogging. If I do fog, I hit the heat button on the battery, and the fog clears quick. Battery life with manual or always-on is pretty good.
Cons: No app support, proprietary charger, battery is on the right side which means removing hands from the throttle to turn on the heat. These have A LOT of venting, and can be cold in cold/windy conditions. The cord that goes from the lens to battery also gets stiff in the cold, and is prone to breaking where it connects to the lens--509 replaced one of mine under warranty, and a buddy broke his yesterday (out of warranty, so will be interesting to see what 509 will do as parts of the google have a lifetime warranty).
Aviator 2.0 Ignite S1:
Pros: Battery on the left strap, but no need to interact with it if you use the app. App support for auto and manual mode. Mini-USB charger. Warmer due to less venting. Cord is improved/softer, so stays flexible in cold weather. Super easy to change lenses with the magnetic system.
Cons: Fogs easily when we stop or are moving slow through deep snow. Battery life is much less than the Kingpin on either manual or auto mode--these frequently go dead on me, so either a second battery is needed, or I switch to the Kingpin's to get through the second half of the day. Sometimes the auto mode works great to run the fan to clear fog, and then sometimes it doesn't run when the goggles are on and I'm all fogged up. But yet sometimes the fan will run when I have the goggles off hanging on my handlebars when we are stopped.
Overall I'd call them both "ok". I don't feel either pair seals that well with my 509 Altitude helmet. As much as I want to like the Aviators for the auto mode, I'm starting to like the Kingpins more, because they don't fog near as often.
I've wanted to try some ABOM heated goggles, but haven't yet.