I absolutely love my SX and it works flawlessly in a Serato environment. I have done extensive work recently on multiple controllers ( NS6, SCS3, Maschine, Typhoon and DN-S3700). As of now I have the best mapping for platters on the NS6 with added platter lights out there. I have had a lot of hours in working on platter sensitivity on units other than the SX, but have invested much time in the SX as well. The problem with the platters does not seem as related to mappings per say as it does to firmware. There is sluggishness in pulling back the platter back quickly.Also a sycncing issue with the platter lights(not sure about that(loses its place when platters are pulled back)could be mapping on this instance) I use Traktor on all my other setups( Turntables and Compact setup as well)and really want to use one software for prepping grids, hotcues and playlists. The mapping that you guys on the website is really good. I would be happy to help lock these platters into a tight setting for everyone but I think the firmware update would be necessary. Please let me know how I can help. I really want to keep the SX and use Traktor exclusively on all my systems. Thank you