Sadly have to report a negative experience with user @sugarfreedaddy.
Collide 4 was purchased on 25 March. Price listed in EUR and seller location in Berlin, but seller's PayPal account was set up to receive PLN. I confirmed with the seller that this was how they wanted it before sending. Paid using PayPal goods and services (thankfully) and added the agreed on shipping costs plus 3.7% to cover fees. When seller was hit with exchange fees that left them short, they insisted that I send an extra EUR 20 via F&F (actually ended up being EUR 21.99 due to my getting hit with the exchange fees this time). Because the price for the module was still very good, I agreed to do this although I did express that I wasn't happy about it due to the listing having been in EUR.
Seller originally committed to shipping the module by 27 March at the latest. When I followed up on 28 March to request tracking details they promised a new latest shipping date of 31 March. I have received no responses to subsequent follow up messages and emails since 28 March.
Update as of 07 April 2026: It's been 10 days without any response from sugarfreedaddy via Modulargrid, email, or PayPal messaging. I've escalated a claim to PayPal and will continue to share updates here.
Update as of 16 April 2026: I was lucky to have had buyer protection in place, as I never heard back from sugarfreedaddy. Neither did PayPal, so they refunded the main payment I sent. Hopefully the other users who were experiencing issues will manage to come out without major losses too. It's still unclear what the circumstances were and I'm not going to speculate publicly, but lesson learned: I'll be avoiding F&F in future unless the transaction is with someone I actually know in person (regardless of rating and even if prior deals went smoothly).