I bought the Teka about 7 months ago. I mapped all my friends bikes until I paid it off. It works great. I think the biggest reason people put it down is because the power commander has more control. The teka is for fine tuning. Example. My friend has an 06 gsxr 1000. He put a slipon yosh rs3 pipe and K and N air filter. I mapped the bike it ran great. He got a power commander, loaded a map from the website and it ran even better. He picked up 2 horse on the dyno. Later he put a full yosh system, he loaded the map from the website and the bike ran horrible under 3 grand. Backfiring, Very rich and choppy. We used the power commander and leaned out the low side as much as possible. This solved 65 percent of the problem. I then plugged in with the teka and leaned out about another 20 percent. Later we eliminated the pair system via marble method and it's almost perfect now. My busa is stock filter, small box mod, tre, bolt on micron carbon pipes, pair capped , teka tuned, and we run side by side down the highway.