Are there any surviving writings by Marcion or is everything we know of him what his enemies wrote of him?

I'm growing increasingly suspicious that Marcion was more of a dispensationalist or "hyper-dispensationalist" who fell victim to misrepresentation by those who either did not understand him or agree with him. Do we have any surviving texts that were written by himself or his proponents? Or by any of his detractors that might put him in a light other than the official view? Please see this related question and the way the enemies of dispensationalist views characterize it as "gnosticism" etc. to see what my concern is: https://christianity.stackexchange.com/questions/19104/what-is-the-argument-against-the-position-that-only-pauls-writings-are-applicab