According to my experience based on comparative tests with my portfolio of 15 brokers, Darwinex being in a majority of cases better than other brokers, statistically an imported track-record would rather have a handicap.
Obviously, there are special cases. A track-record of scalping from FXCM would have no value, since the commission is not indicated according to standard MT4.
One of the key advantages of Darwinex is its method of paying traders. A scammer who wants to manipulate the system will not do anything, because he must first generate a gain for 3 months before receiving a penny.
Frankly for me this history of reliability of migrated track-records is not a major topic.