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Alex the M210 is a very nice visual scope, mine was often dew soaked on the outside but the mirror never dewed up.
Things to consider:
It needs to be allowed to cool to ambient or you will be looking at woolly stars
Will the diffraction spikes bother your sketching pursuits, the M210 has 4 spikes, the M180 has 6 slightly fainter ones
DK scopes without correctors will show some coma
Focusing is by primary mirror unless you install a second R&P focuser
There is some minor mirror shift during focusing so always do the last bit of focusing by pushing the primary forward
The removal of the mirror and cell is easy but make sure you replace it in the same orientation or you will need to recollimate it
Do NOT change the collimation screws for Bob's Knobs etc
The collimation holds very well with the original screws
The secondary is not centre spotted so best way to finely collimate is by star but to do that the scope must be thermally at equilibrium.
The finder mounting is good enough for the scope to be carried by it
The finder is bolted on with 2 M6 screws from the inside so could be replaced with a RACi if needed
If you're going to wash the mirror don't wet the baffle tube while doing it...
The mirrors are very well made and coated, a 10 year old mirror was indistinguishable from a new one...
Did I mention that you must let it cool properly if you store it somewhere warm....
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