I’ve used my Kickstarter Waydoo Flyer One about a dozen times since I received it in October. Only issues I’ve had are a small weight gain on the board due to water ingress/absorption (less than 1kg, which drains away after 24 hours) and a few times while riding my remote will display an “S” on the display indicating a signal issue and showing low battery, which goes away once I throttle down for a few seconds. Unclear if this signal issue is related to the near freezing conditions I’ve been riding it in.
There seem to be issues with some production batches - fortunately mine so far does not seem to be from a problematic batch. From what I’ve heard Waydoo is shipping warranty replacement parts as problems arise.
If I was in the market today I would purchase from a reputable retailer (such as MACKite) that will handle any warranty claims, while waiting a few months to see if quality improves to avoid warranty-claim downtime. I would also wait see what FOIL is able to ship this spring (at a similar price point)