who knows ZYX retipping or refurbish ?

@andychris 

That's not correct, they can repair your original cartridge if it's no more available on the market, but the price will be the same as if you want a brand new cartridge from the new serie.

Never heard about it, did you repaired some of your ZYX via official distributors or someone told you? My statement is based on my personal experience with ZYX USA  

I send my cartridge directely to zyx for an "official" repair and they done it because my cartridge was no more on the market and I didn't want the "ultimate" serie as I don't know them. I also had a suspension problem with another cartridge from ZYX, I send it back and they changed the suspension, so they can repair their cartridge, not only buy you a new one.

 About the problem of sealed bodies, the problem is not a problem when you are the manufacturer, you just have to "crack" the bodie and place a new one, I think a new bodie should cost them at least 10$  ;-)

@andychris good to know, but you said the price was almost like the brand new model from the newer series, once i upgraded from Airy III to Premium 4D the difference was noticable. Which old model you decided to keep?  I believe the body is the same as the Airy and surely on the factory they could replace the body, but aftermarket retippers can't do that anyway.