I pre-ordered the 6 Filter set from PolarPro about a month ago.  Tuesday I received a notice from PayPal that PolarPro had shipped my filter set and provided the tracking number.

I kept watch on the tracking and all the USPS site said was, "Label printed, USPS is awaiting package receipt."

Late yesterday (Thursday) I received a notice from PayPal saying that PolarPro had refunded my payment.  I immediately dropped PolarPro an e-mail asking why they cancelled my order.  No response!

This morning I e-mailed their Operations Manager an asked why my order was cancelled.  No Reply.

This really shakes my faith in PolarPro!

I've read some online reviews that say the PolarPro filters are causing problems with the Spark Gimbal but if that were the case, I wish they'd just send out an email and tell me that instead of just refunding my order with no explanation.

Anyone have any experience with the PolarPro filters and the Spark?

See this thread:
http://forum.dji.com/thread-105174-1-1.html

Seems there's a recall.

Thank you!