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Hi John!
The ETX90 which i use does not have a mirrorlock. But thats not a real problem. The mirror, if it moves, moves once during meridian passage, so usually i am doing many 6 minute exposures - in 3 hours i get 30 images and maybe 2 of them are bad because of mirror movement.
The mirror movement is only a problem for the focus on the C14 and on the ETX90. After meridian passage i check and readjust the focus of both telescopes. This are the only "non mirror lock" issues i have.
So, i dont see the missing mirror lock as a real showstopper.
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