Based on what I have seen, ladders are performing better than ladder-radars. I think the catalogue value of ladder-radars is high, especially on more modern series. In fact, the catalogue values on both groups are very close. For example, for bird series $20s, ladders are $550 and ladder-radars are $500. If I was prospecting, I would bet on bird series ladders as the Bird series finally appears to be gaining strength.
I would put market value on a bird $20 ladder-radar at more like $350-$400. I would even go as far as to say the catalogue value of ladder-radars keeps the market value higher than it would be otherwise (because of bargain hunters).
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I believe error notes currently has a higher market value than catalogue value correct?
I wouldn't say error notes as a whole are increasing in value. Certain kinds are doing better than others.