I purchased a SunTour X-1 rear derailleur from them over 10 years ago and set it up with a SunTour Winner Pro 7 speed freewheel and matching SunTour Superbe Pro 7 speed accushift shift levers and an XCD front derailleur and was able to set up a sweet shifting 3X7 touring bike that had zero issues. I liked their SunTour page on their website but it is super not up to date now.