Another thing to note about the DimSport based handheld flasher based tunes is that there are a lot of tunes available from DimSport via their repo. Dealers cannot see the maps before they buy a license to use them. Some are good (I had a good experience with my AMG C63 - verified on the dyno) and some are junk and dangerous like the 14th Feb 2025 "L0L2" SLR Gen 3 tune that I got. It is a bit luck of the draw and dependent on if the dealers make any useful changes to the mod files them selves or just resell the DimSport offering.