Gloom if you're getting stumbling at low rpm I suggest you change the goal voltage settings for your o2. I changed mine to low .44, mid .51, and high .59 ( ifi recall properly) and she's smooth as can be.
That being said..... Buell o2 sensors are not heated. They do not do well with contaminants in the exhaust stream, that's why heated o2 sensors last much longer. I use a heated o2 sensor in my Uly, it gets into closed loop within seconds and if running something like 2 stroke oil in the fuel will help it last much longer, esp if your bike sees a lot of short trips.