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Matt has got a good point - part of it also depends on what scope you have (in particular fl) and more importantly its quality. With top tier refractors you will use a 5mm all the time (I do at least for planetary) but with long fl reflectors etc Matt is right that it wouldn't get as much use due to magnification v sky conditions.
You already have the 7 & 10mm and as one IIS members signature notes 'life is too short to suffer bad glass". If you buy the XW you will never be wondering whether there was something else better 'if only' you had saved/spent a little more.
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