I guess my main concern with all of the records being found on my family tree by MyHeritage.com's Record Match program is how to find enough time to look at and add all those records? I have still got almost 500 FindAGrave.com records to look at and process and now, with all of the US Census Records online and searchable by Record Match, there are hundreds more to review.
I have gotten some feedback from people who have signed up recently, say in the last month, since RootsTech 2013, that the feed from the Record Match program is slow in starting. But my wife, who only signed very recently, already has 360 matches in 10 different collections, including 21 matches in the 1900 U.S. Census. I am assured by MyHeritage.com that we are not receiving any kind of preferential treatment. I suggest adding to your profile and updating any information you have in the program and checking back regularly to see any progress.
One thing that did happen, was that my wife had not gotten any Record Matches for a while but discovered that she had not properly uploaded her file. When she looked, she and her parents were not connected to the rest of her family. When she made the connection, she started to receive matches.
My total matches at the time of writing this post is 2,679 records. I am finding photos, stories and all sorts of information from the matches. I suggest patience.
I have noticed that the number of new record matches I have from Ancestry.com is also going up lately. Perhaps they are feeling the competition? Well, I don't think it is competition at all because the records covered are similar in some respects but enough different to make them both a valuable source of records about family members.