I like that it's easy for people without technical knowledge or software experience (like me) to use this product since there are so many tutorials available online as well! It is very user friendly too which makes things easier in general terms.
Not really anything specific about field sync but i have used other products by them before and nothing bad came up then either - they were both great though :) We've been able solve some problems we had previously using their services such as creating custom fields etc.