Okay, so I liked the Bushbuddy Ultra. And the Bushcooker Lt II is built on the same principle and even lighter. I decided to give it a try.
The Bushcooker Lt II multi-fuel stove, on the right, is one solid unit with no moving parts. It looks like a little rocket ship. Very cute and very light. Made of titanium, on my scales it weighs only 3.2 oz. It can burn Esbit, alcohol, wood or charcoal. I tested only wood, as it is my fuel of choice. The Bushbuddy, my favorite stove at 4.9 oz, burns only wood. See my review of the Bushbuddy here.
The Bushcooker Lt II started right up with cotton ball and spark and I had a nice fire in just seconds. I placed the pan of water on top and let the fire do it’s work.
Although I was able to keep the fire going no problem by removing the pot and adding small twigs, it did not seem very hot. It burned better when the pot was off while I was re-filling the chamber than when the pot was over the fire. When the pot was in place the fire seemed to simmer down as if needing oxygen. 
As the coals accumulated this appeared to also limit the air flow, weakening the fire further. By stirring the coals occasionally I could increase the air flow and get the fire cranking again. I was able to boil water, but it was slower than the Bushbuddy by a long shot. I used this stove for 2 people over a 3 day backpacking trip.
The Bushcooker Lt II works much like the Bushbuddy, but delivers less air to the fire. Looking at 
the bottom grate on each unit it is clear that the Bushbuddy allows significantly more air into the burn box. Also the perimeter holes around the bottom of the Bushbuddy are larger. It may be that the Bushcooker Lt II’s big brother the Bushcooker Lt III at 5.5 oz would be a more even comparison with the Bushbuddy Ultra. Since it’s larger it should allow more air to circulate. However, I did not test the larger unit. I also think the Bushcooker Lt II may be excellent as an alcohol burner, but I did not test that either.
For now I find the Bushbuddy Ultra to be the best wood-burner of the two for two people. It’s faster and keeps a steady hot fire burning when fed small sticks. The Bushcooker Lt II is lighter, but I found it’s design did not allow enough airflow to the fire at 6000 ft.
In my back yard at 2500 ft. I had these results:
Time to boil 1 liter of water starting from a cold stove :
Bushbuddy Ultra 4.9 oz: 12 minutes (BPL claimed time 8-10 minutes)
Bushcooker Lt II 3.2 oz: 23 minutes (Four Dog Stove claimed time 6 minutes)
Clearly, I’m not a champion fire builder, but I’m at least average, probably a little better than average. In any case, my skills were equally brought to bear on both stoves.
The two main differences in these stoves are time and weight. In this case, time wins over weight for me. I’ll stick with the Bushbuddy Ultra as my curent favorite wood-burner.
I totally agree with you Carol about the frustrations of getting this stove to perform as one would like.
I have struggled to get it to perform how Don demonstrated to me at the recent show in the UK.
He used a primary fuel source, such as a tin lid of meths or an esbit tablet, beneath the cooker first, and then the wood fuel inside the chamber to produce a dramatic heat. However no matter what I do, I can’t get a sustained heat from it, and thus the water never comes to the boil.
My Honey Stove design albeit heavier, provides a more consistent controllable heat and even though it is heavier than the Bush Buddy / Cooker, the ability to flat pack and use in different formats with different fuels, makes it more reliable.
I love this stove and the weight and construction, but I do think there are issues with the air flow to keep the intense burn lasting longer.
Best wishes
Bob
PS: The interview with Don can be found here http://www.backpackinglight.co.uk/page116.asp