In fact, those high density connectors can be a pain on their own:
- they cost an awful lot of money even in medium quantaties
- alignment is critical, especially if you have more than one per board. 
Small alignment errors - which sometimes are even hard to avoid when using 
properly designed alignment holes - can lead to stress on the contacts 
and/or result in contact failures. The tolerances allowed in the connector 
specs have to be split up to alignment errors on both baseboard and som - 
making life not easier.

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