I can't imagine where you are getting such wrong information. Magnum is supported by
www.HobbyPeople.net
Their warranty and service is excellent, the products are excellent. Look in the RCU engines forum for a couple of threads on Magnum users. I have run their 46XLS, 91XLS (2 strokes) 52, 70 and 91 4 strokes. I like 'em, and recommend them.
edit: web site correction