Is anyone else running a US feeder fund into a main EU fund? Would be great to hear your insights.

This is prohibitively expensive. You need a $25 MM fund size to justify this, and it really would only work if you had many LPs and portfolio companies in both jurisdictions. The EU is too expensive as a domicile for most new managers. The minimum fund size is $15 MM to $25 MM to domicile in the EU. VC Lab is exploring ways for EU funds to domicile in the US, as well as setting up a lower cost alternative domicile in the EU.