These are so difficult to put a price value on.
They are great markers, but the feednecks are a known issue. WHile yes, gog is doing the work and charging for it, this just means that WHEN it breaks (not if) how long are you without your marker. Oh, and the battery things is a turn off as well.
That said, 250 would be a reasonable offer. the problem is that people that own them thing 400-450 is a reasonable price.