Dealing with Wing, it's not a problem of communication or reliability, i think you can trust them, they seems professional and honest sellers.
It's the global process slow. For example my frame was done july 1st and was only sent july 8th. It's 1 week lost, and now the problem with the post delays me 2 or 3 weeks more.
Not to mention first contact around april 15, they said me 1 month delay... Why advertising for a frame you need in fact 4 months to deliver.
So yes to potential buyers, be really patient. Moreover i think the factory will probably have to build the frames for stevens bike, ns bikes in priority.