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Hi DSB
I have just bought a 12" collapsible (and we have consequently had one of the wettest springs for many years!), and have had no problems with collimation other than the usual tweak that may be needed before each use. Once set, collimation so far has held nicely throughout the night.
I am very happy with the scope, and the fact that it collapses gives natural lifting ponts from the truss supports when moving around. I lift the OTA off the base, move the base outside to where viewing will take place for the night, and then carry the OTA out. A solid 12" tube, in my opinion, would probably feel more cumbersome to carry around.
The other impressive thing I found with the Skywatcher, was the packaging that it came in. I bought mine from My Astro Shop, in Queesland, so it had to be freighted all the way down to SA. Skywatcher package their OTA's in two HD cartons, one inside each other. With this style of packaging, together with ample airspace and solid foram cut-outs around the unit inside the carton, give plenty of protection from transport issues.
Cheers
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