I’m going to try and keep this pretty short. Sending your ecu off to get flashed you have a tuner that spent all of his time and knowledge building a good map and it convenient. This map is built off someone else’s bike. Every bike is a little different when it comes to building maps. That person is also more than likely in a different elevation, temp among other things than where you live so the map will be off even more. Then you still are in that close range yes some will see improvements some will see more than others. As were if you buy power commander or buy an actual ft ecu harness and install it to your bike. Then you have a reputable tuner run it on a dyno and build a map for your bike it will be to your bike, to the area you will be riding in. It’s more of a hassle and expensive. You can’t go wrong with either route as long as you choose reputable people. They both have pros and cons so it’s up to you to decide what suits you the best.