Although I haven't downloaded this content, it looks to be fairly good quality if it all works as advertised. Although for some items they are overmodelling which may potentially cause issues on larger projects with the amount of detail that is being shown. One would hope they have set the models correctly with coarse, medium and fine displays and that the individual family sizes don't exceed 1MB each.
See for yourself.
We create your customized Revit Families - Welcome to Revit Content
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