DC07 vs Thunder
I have a DC07 as well. The Thunder will outclean it and the DC33 on carpets. The DC07 has great hose suction but balances terribly making it incredibly difficult to use tools with.
The a Fantom vs. Dyson evidence is just evidence that the cyclonic design can be applied more effectively to make a better cleaning machine. It isn't about being able to buy a Fantom. Dyson hasn't been able to devise a way to outclean a machine based on his technology in 20 years, or at least at a cost he likes, profit he wants or design direction he seeks.
EuroPro should just take the original design of the Thunder to China and start churning them out.
Others have made better cleaning bagless vacs as well, long before Dyson did. A single speed E Series Rainbow (and probably well maintained D4) will outclean the Dyson. Against the current ones? Forget it.
A good vacuum isn't just suction, brushroller, airflow, bagless or bags, it is good utilization of technology and combination of all factors.
Dyson took cyclonic technology and made it effective in a household vac. I commend him for this. They're amongst the more reliable discount store brands. I believe the Fantom Thunder is still the best utilization of the cyclongic design in a household vac. I believe the Rainbow to be the best cleaning of the commonly available bagless vac designs.
I believe many bag vacs will also outclean a Dyson, besides Kirby.