I am sure they are good because the local MB dealer signed a contract with them to tune cars in MB house. They have stopped dealing with them because it seems they were not so interested in such a small market. Slow feedback but the tune was great until I did a dyno tune which is even much better than off shelf ecu tune. Simon motorsport is a great tuner.

He is best bro

https://www.youtube.com/user/tasosmos2/videos

scroll way down and start watching

thats it

https://youtu.be/rc4CtO4XqJc

thats the dyno tune at simon motorsport 2 years back. He is a good reputed mechanic shop and tuner in dubai and germany.