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The GSO 90mm f11 refractor gets the top rating as a grab-and-go in the book "Astronomy Hacks" by Robert and Barbara Thompson (written in America, packed full of useful info; especially for dob owners). They do make the point about what you want to look at. If it's in an urban setting and you can only grasp the brighter stuff, this scope will do a nice job of high mag on the moon and planets and also pick up the brighter DSOs. They reckon it's better quality than the Skywatcher. If you want a wider, low power field of view, the shorter tube refractors would be better; but they won't do the high mag as well. They also reckon that it is better moved onto an alt-az mount (AZ3) rather than the EQ it comes on. All just their opinion of course...and I'm just passing it on.
Bruce
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