I bought this as part of a package deal, but have never used it since I have a Losmandy G11.
Apparently, they work amazingly well. I'll never know as I don't have a Celestron mount purchase on my 'to buy' list.
Bintel list these at $549
https://www.bintel.com.au/product/ce...qSDxoCMeTw_wcB
Yours for $440. I'll pay postage too