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I may be wrong, but I think the GSO diagonals are made of two or three pieces (excluding the mirror) that are 'stuck' together. The WO models (and even more expensive ones like TeleVue, Lumicon, etc) are machined from one solid piece of metal, which means the alignment is permanent.
Having said that, if you treat the diagonal carefully there is no reason it should go out of aligment, but if you were to drop it one day...
There may also be differences betwen the optical coatings used on the mirrors, e.g. the more expensive models may have 'harder' coatings that are more resistant to wear and will last longer.
I just bought the WO $239 model today and I must say it is a beautiful piece of engineering, and is so much brighter than my old (non-dielectric)model it's like I've gained an inch of aperture!
If you're just starting out and you don't want to spend too much, then GSO equipment generally is very good for the money, and I would hope that their diagonals are too. Where I would be more careful is with cheap eyepieces. For focal lengths under 15mm, I reckon you need to pay at least $150 for decent performance. At longer focal lengths you can get away with cheap eyepieces a bit more. All my humble opinion of course!
Morton
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