I also don't recommend MyHeritage over FTDNA, or over Ancestry for that matter.
Way too early in their development.
Matches, particularly for /with those kits that have uploaded from elsewhere are still showing "surprises" that GEDmatch doesn't necessarily bear out - although WAY better than the initial beta that should never have been released.
NO chromosome browser - although their talk at RootsTech promised both a chromosome browser and a more easily viewable pedigree view tree.
NO way to filter results by most recent results.
NO way to download a list of your matches (that I've found anyway)
The above being my main gripes.
BUT that said, I am finding that some of my matches from the other companies, where they don't have trees, DO have trees on MyHeritage, however painful they are to navigate.
I see someone has already posted a link to DNA-eXplained's blogpost, which is well worth reading, including all the comments (as is also her post on ethnicity results from MyHeritage, which do seem to be available for those who tested there, but not for the initial uploads as promised - not my highest priority from any company but a promise is a promise)
May 2017 update: Ethnicity results are now available for my FTDNA kit transferred to MyHeritage
A couple of my blogposts may also be of interest - http://dnasurnames.blogspot.co.nz/search/label/MyHeritage