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My experience is that my 8" and 12" GSOs, once collimated, survive long trips to the country - the 12" in a trailer - without going far out of collimation. I have the secondary holder held firmly in place with the three collimation screws tightened "against" the centre screw, and the three "lock screws" tightened on the primary mirror cell during transport. They sit variously on carpet, blanket, styrofoam for transport. So I'm satisfied, given I'm able to tweak as necessary, once setup.
It's a good question as to how much more one would pay to get superb mechanicals and engineering. Based on the cost of Takahashis and Obsessions etc, I have a sense that 10 times more would be likely. However, based on the fixes people sometimes employ to great effect (eg. stiffer springs), you would imagine that an extra 20% spent on them might make a significant difference?
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